Friday, 23 May 2014

trough mashing, fire cracked stones and ale

Time to write something about those enigmatic burnt mounds. In the news recently, yet more burnt mound sites have been uncovered in Galway, Ireland, during road works for the N17. So it seems apt to be writing about them. It's not easy to find a typical picture of one of these sites. On Orkney and Shetland, the buildings were often made of stone, so the footings survive in the ground. In the rest of the UK, timber was used as a building material. And that does not survive well in the ground. All you get is postholes, if you are lucky, the remains of a wood lined trough and a pile of fire cracked rocks - the burnt mound.

An important feature of these sites is the large, deep trough. It might be lined with wood, or with stone. The picture below shows the excavations by John Hedges, around 1975, of a stone building at Liddle on the island of South Ronaldsay, Orkney. In the centre, they were surprised to find a huge stone lined trough. Radiocarbon dates from organic material within the trough tell us that it was in use about 3000 years ago, in the Bronze Age.

excavations at Liddle burnt mound, Bronze Age building & stone lined trough, South Ronaldsay, Orkney ((Hedges 1975)
see 'Excavation of two Orcadian burnt mounds at Liddle and Beaquoy' by John Hedges, 1975 Proceedings of the Society of Antiquaries of Scotland. pages 39-98  Vol 106

what is a burnt mound?
I must have talked about these curious archaeological sites with many thousands of people over the last few years, having worked as a tour guide at the Tomb of the Eagles/Liddle Burnt Mound Visitor Centre. Most people who go to visit the Tomb have never heard of a burnt mound, unless they are an archaeologist. In Ireland, over 5000 burnt mound sites are known. In Scotland, about 1900 have been excavated so far. They are also found in England and Wales. The burnt mound itself is a pile of fire reddened and cracked stones, often in a semicircular shape as they have been thrown onto the heap. Thermoluminescence dates from stones at Liddle hint at about 500 years of continual use. The stones were put into a fire to be heated up, then dropped into a trough of water, to heat it. Archaeologists agree that burnt mound sites are something to do with hot rock technology - using hot stones to heat lots of water - but to what purpose? That's what archaeologists can't agree on. There have been several suggestions:

- they were used to cook meat. The idea is that you wrap a big piece of meat in straw and leave it in the heated water trough for several hours. You probably have to keep putting more hot stones in, as the water cools. There are easier ways of cooking meat.

- they were a sauna or sweat lodge. I don't understand this. In my experience, a sauna has a few hot stones upon which water is splashed to make steam. You don't need a large trough of water and lots of hot stones.

- you can wash sheep fleece or wool in them. This seems to be a practical idea. Fleece must be washed before it is spun into wool for clothing. The picture below, showing Tony Sherratt and Keith Prosser of Timezone washing a fleece, gives an idea of the size of one of these troughs.

experiments at the replica Cruester burnt mound trough, Bressay, Shetland. details here

None of these suggestions are controversial. Most people reckon that the troughs would have been multi functional - a bit like the kitchen sink only much bigger. When it was suggested that these sites could have been used for making beer, some archaeologists became ever so slightly annoyed. Although the idea was first put forward in 2007, backed by successful experimental work and sound brewing theory, it is still considered by some to be controversial. I don't know why. Hot rocks are ideal for heating large amounts of water to the perfect temperature for mashing, which is between 65 and 67 degrees Centigrade. Getting the water much hotter than this is very difficult. We found it impossible to get the water to boil. 

troughs as mash tuns
The possibility that they were used in the making of ale or beer was first suggested by Declan Moore and Billy Quinn of Moore Archaeological and Environmental Services Ltd. I first met them at a Conference about beer and brewing in prehistory and antiquity, held in Barcelona, October 2004. I gave a paper about the importance of malt in the brewing process. Billy and Declan asked me whether it was possible to make beer in a hole in the ground. We agreed they should have a go.

The following year, they came to Orkney to meet Graham and to learn a bit more about how to make ale and beer from the grain. They tasted the wort and were surprised how sweet it is. They tried Graham's beer and liked it. Then they went back to Ireland to do their own research into hot rock mashing in a trough. It went extremely well, and led to their now famous video on You Tube. They wrote an article for Archaeology Ireland and there have been several more articles online since then. The details of their subsequent work are on their web page.

They gave a demonstration of the technique at the Sixth World Archaeology Conference in Dublin, 2008. I was lucky enough to be there and it was spectacular. The smoke, the steam, the hot stones and the aroma of the mash! All of these things added to the magic and drama of the demonstration. If an archaeologist is looking for an impressive show of ritual, power and transformation in prehistory, then a hot rock mash ticks all the boxes. 

One day in the summer of 2009, I got a phone call from Billy. He told me that a trough with grain in it had just been found in Wales. The well preserved trough, with wood lined water channels, was excavated by Dave Chapman of Ancient Arts who went on to do some mashing and brewing experiments of his own. He was successful, as reported in British Archaeology news.

We had to try this for ourselves. So far, we had been mashing small amounts of crushed malt in earthenware bowls. It was clear that the 'hot rocks in a trough' technique worked much better. Graham made a small wooden trough, about one third the size of the real ones, and we had some fun mashing with hot stones. It is best to use stones from the land. Rocks collected from the beach explode when being heated in the fire. This is very dangerous.

We had an opportunity to mash in the replica trough at Bressay, Shetland in the summer of 2011. The same trough that was used to experimentally wash fleeces. We cleaned it well and luted the corners with local clay, to prevent water leakage. This explains the grey colour of the water in the photo below. There was initially some concern that there might be a problem. It turned out to be the clearest, sparkliest ale we have ever made. Bentonite powder, a derivative of clay, is used today to clear wine and beer.

the strike - 50 kg of crushed malt is added to about 250 litres of hot water in the replica Cruester trough, Bressay, Shetland.
We used a garden fork to stir it about.
A successful mash. Adding a few hot stones kept the mash at an ideal temperature for the conversion of starch into sugar, which took about an hour. We put a piece of wood over the trough for heat retention. 

crushed malt & water transformed into 250 litres of wort in the trough, enough to make plenty of ale for a feast.
cheers! our clear and bright Bressay ale.

After taking some of the wort from the trough using jugs, we added brewer's yeast and fermented it for several days. We only had one fermentation vessel, so we could not make use of more than 6 gallons of wort.

Next morning, when we went to empty and clean the trough, all the wort had drained away. Only the spent grain was left. Although we had clay luted it, the reconstructed trough is above the local water table. Meadowsweet flowers, about an ounce and a half, were added to the 6 gallons of wort when it had finished fermenting.

The result was a strong, clear ale. You can see all the pictures of our Bressay mashing and brewing adventure on my Facebook page. The ale kept really well.

We bottled it and sent some to the Past Horizons people to taste. It did take a while to open the parcel, but I think it was probably worth it.


neolithic burnt mounds and fire cracked stones
There are excavations taking place in Northumberland, not far from Bamburgh Castle, organised by the Bamburgh Research Project. Several burnt mounds have been excavated and archaeomagnetromic dates that have so far been obtained indicate that these burnt mounds were in use during the Neolithic. Pottery finds support this interpretation. The dates obtained so far are 6,230 +/- 50 years BP at 95% confidence. There is a good summary of the excavations here.

St.Arnoldus.jpg
Bishop Arnold of Soissons
In December last year, there was much discussion and argument on social media about some neolithic wooden tridents that had been found at a multi period site in Cumbria, which included several burnt mounds. What were these long handled wooden 'forks' used for? Fish prongs? Or maybe they were used for catching eels? Interpretations varied amongst archaeologists.

We think they would be a useful implement for stirring the crushed malt into the hot water - the strike. The crushed malt, also known as grist, clumps together when it is being added to the hot water. It is important to stir it about. It is also necessary to stir the mash when you add more heated stones. You don't want to have hot spots, you want to maintain an even temperature throughout the mash. The fork can also be used to move the hot stones about in the trough, if necessary.

In the Bressay trough, we used a garden fork. The handle was far too short and a long handled wooden trident would have been ideal.

Bishop Arnold of Soissons (who lived from 1040 to 1087) was the patron saint of brewers in Belgium. He is depicted with Bishop's mitre and a mash rake, which looks very much like those neolithic wooden rakes excavated in Cumbria.

Several neolithic buildings have been excavated at Kingsmead Quarry, Berkshire, England, by Wessex Archaeology. They have been interpreted as houses. This site is another very complex, multi period discovery, with finds ranging from the mesolithic, neolithic and Bronze Age through to post medieval structures.

One of the four neolithic rectangular timber buildings, or 'houses' at Horton caught our attention when we were looking at the images online. There seem to be some fire reddened rocks close by the trenches that reveal the outline of the building in the photo below. What are they? They look rather like modern bricks, but the stratigraphy indicates that they are contemporary with the building. Are these stones an indication of hot rock technology at neolithic Horton? If so, exactly what were they doing in and around this wooden building, over 5000 years ago?

the footprint of a neolithic rectangular timber building at Horton, Kingsmead Quarry, with a big pile of fire cracked stones.
Details of the excavation here.



We looked through the reports online but could not find a reference to them. Quite a mystery! Graham managed to enlarge the section of the image with the rocks in and here it is. In close up they look even more mysterious. We look forward to reading the full excavation report to see what the interpretation of these rocks might be.

a close up of those mysterious fire reddened stones.
We would love to hear your ideas about burnt mounds, troughs, mash tuns and the possibilities of hot stone technology. This technique, of heating water and the mash with hot stones, is so successful that it has been done from the Neolithic to Viking times. Some burnt mounds provide dates that indicate this.

Thanks for reading, this post became a bit longer than I had intended.

Monday, 19 May 2014

desperately seeking sugars

A few years ago, we were standing beside the trench of an excavation on Orkney. Lots of serious digging was going on. One of the diggers looked up, recognised us and said something like...

oh hello! Are you those brewing people?

Yes, that's us. 

Can you tell me how to make Heather Ale?

Of course, we replied. No problem.

Because we've got loads of heather growing around our house and we want to make some beer with it! 

But you can't make beer from flowers, we replied. Flowers provide the flavouring, the preservative ... you have to add sugar. That's what ferments into alcohol. 

beer made from flowers?
We began to think that, maybe, when some archaeologists had come across our work on prehistoric brewing and heard about our ancient style meadowsweet ale, they thought that we had made it from meadowsweet flowers. We had not considered that before. Later that month, our suspicions were confirmed when we did a prehistoric brewing demonstration at a neolithic feast, organised by the Orkney Archaeology Society. I think it was in 2008. Over an open fire, with just the hot ashes, we heated some water in an earthenware bowl. It was our mini mash tun.

When the water was clear enough for us to see our reflection, we knew it was the right temperature.We added the crushed malt. This is known as 'the strike'. The local hens came running when we got the malt sack out of the van. Soon, there was the sweet aroma of the saccharification, this is when the enzymes re-activate in the mash tun and turn grain starch into malt sugar. It smells delicious. Folk began to wander over to find out what was going on. Some of them tasted the mash.

We were asked how much sugar we had added. None, said Graham. All the sugars come from the malted barley in the mash tun. No, go on, there must be some added sugar in there! No, we assured them, there was no added sugar. Later a couple of ladies asked how many flowers we had used to make our ancient brew. The answer was about an ounce and a half for five gallons of ale. They walked away, shaking their heads in disbelief. I am quite sure that they had confused what we were doing with making a flower wine.

Check out the recipes for "country wines" online - they all have a couple of pounds of sugar per gallon in the list of ingredients.

Quite simply, it is not possible to make ale or beer from flowers.

beer made from birch sap? 
Birch sap contains very few sugars, less than one per cent. It is more like a sweet water. You could collect a lot of it, then boil it to make a syrup but it is hardly a practical way of obtaining sugars for fermentation. John Wright, writing in the Guardian, explains how to make birch sap wine. The ingredients include 1.8 kilos of sugar and grape juice concentrate.

beer made from bread?
Some archaeological and anthropological sources suggest that beer and ale were made from bread in ancient times. There is a common myth that beer was discovered when a loaf of bread fell into a bucket of water and fermented overnight.

If it was really possible to make beer from bread in ancient times, then why aren't we doing it now? Surely people would be queuing up to buy loaves of bread so that they could throw them into a bucket of water to ferment for a few days. Home brewed Egyptian beer. It might taste horrible. It might be a bit weak and sour. But that's what it was like in the past. Wasn't it?

Sorry to disappoint you, but it is not possible to make beer from bread. The biochemistry does not allow it. There are no sugars in bread to ferment into alcohol. However, a quick search on the internet shows how the idea that bread can be somehow transformed into beer still prevails. There are lots of different methods suggested. Here is just one example:

" Barley was used to make beer. The barley was combined with yeast and made into a dough which was part-baked in a stone oven. It was then crumbled into a large vat, mixed with water and allowed to ferment before being flavoured with dates or honey. Recent evidence suggests that barley malt may also have been used in the process.www.historyonthenet.com

If you crush the barley into flour, then make a bread you have destroyed the fabric of the grain. There is no possibility of germination, no possibility of starches being turned into sugars. No beer or ale. Baking in a hot oven alone would be enough to destroy any enzymes. It would also destroy the yeast. This method would not work.

The recent evidence, referred to above, is that of Delwen Samuel. Analysis of residues on 3000 year old ancient Egyptian pottery showed erosion pits from the enzymatic action in the the individual starch granules. This proved that the grain had begun germination - it was malt.

Delwen Samuel's papers are available online. In 1997 she published 'Fermentation Technology 3000 years ago. The Archaeology of Ancient Egyptian beer'. The scanning electron microscope images of pitted starch granules can be seen there.

beer is made from malt
To make ale or beer, you need malt. This is grain - barley, wheat, oats or rye - that has begun to germinate. Germination stimulates the production of the starch converting enzymes. Making malt is a specialised craft in itself. There is far more to it than soaking grain in a bucket, then letting it sprout. The two crafts of maltster and brewer are separate today. The maltster supplies the brewer with malted grain.

mashing 
The brewer heats the crushed malt with hot water in the mash tun to make malt sugars. Sugars ferment into alcohol. It's a simple but very obvious thing. Over the years, we have given demonstrations of what happens in the mash tun, of how the crushed malted grain is heated up gently, to make malt sugars. This is known as the mash, or saccharification - the enzymes in the malt are active at about 65 to 67 degrees Centigrade, so this is the temperature to aim at in your mash tun. 

The mash tun can be an earthenware bowl, heated in the ashes of a fire. We have done this many times, the image below is from a demonstration at Eindhoven Museum. I went there in 2009, as part of a brewing forum organised by EXARC.

a mashing demonstration at Eindhoven,

Or the mash tun can be a wooden trough in the ground, heated by hot rocks. We have done this several times. The pioneers of the technique are the Moore Group archaeologists. The video of their hot rock mash in a wooden trough, first done in 2007, is now legendary.

Given that thermometers are a recent invention, brewers in the past learned how to judge this temperature by skill and experience. John Tyndall, giving a lecture on Fermentation at the Glasgow Science Lectures Association, October 19th, 1876 said

"Our prehistoric fathers may have been savages, but they were clever and observant ones ... the art and practice of the brewer are founded on empirical observation ... the brewer learnt from long experience the conditions not the reasons for success" 

In the scholarly literature and in many of the archaeological and anthropological academic papers about making beer in ancient times, a wide range of beer making ingredients have been suggested - barley, wheat, dates, figs, fruit, berries, birch sap or birch syrup, honey or flowers and leaves.

All that any brewer needs to make ale or beer is water, malt, herbs and/or hops and yeast.

Wort is the sweet liquid that comes from the mash tun after sparging. The exotic ingredients of the scholarly papers can enhance the ale in several ways, by preserving, flavouring or by providing medicinal or other properties. But they do not provide the primary fermentable sugars. This comes from the grain, which has been malted, mashed, lautered and sparged. Barley is a reliable source of sugars for fermentation. You just need to know how to make it.

There is no need to go desperately seeking sugars.

Just understand the malt, the mash and the saccharification that occurs in the mash tun.


further reading
The Big Book of Brewing by David Line
In our opinion, this is the best book to read on the processes of malting, mashing, lautering, sparging and fermentation.

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two years later 
I went to a talk recently, it was about the neolithic, grooved ware and the use of pottery. My impression, after talking to several archaeologists, is that it still seems to be a widely held belief among archaeologists that 'alcohol production' in prehistory was no more than guesswork. It involved mixing up random stuff to make 'something alcoholic that did not taste very nice'. No skill involved.










Tuesday, 13 May 2014

controversy in a grooved ware bucket

 The Larger Vertical Stone
Balfarg: an ancient site on a housing estate
The focus of my research changed suddenly, from the British Bronze Age to the Neolithic, one day in the summer of 1997. I was reading an excavation report about the prehistoric ceremonial site in Scotland, known as Balfarg. It was a large and complex place. As well as a neolithic henge and stone circle, which was preceded by a timber circle, there were the remains of mysterious rectangular timber built structures. There was also a ring cairn and a ring ditch. Lots of prehistoric pottery was found, ranging from neolithic bowls and large grooved ware bucket shaped pots to bronze age beakers, tripartite food vessels and bucket urns.

Pits contained what the excavators interpreted as "ritually charged" material. These so called "ritual pits" contained large quantities of broken and burnt pottery, mixed up with charcoal and burnt bone. Apparently, these things were deposited deliberately. In other pits there was no pottery, just charcoal, and the pit had been carefully sealed with closely packed stones.

Residues were noticed on a few sherds of neolithic grooved ware that had been buried in one of these pits. Analysis of these cereal based residues with meadowsweet pollen are similar to those found on Bronze Age pots, specifically, the Strathallan Food Vessel and the Ashgrove Beaker, which have both been interpreted as possibly being the remains of ale.

Were they making malt and ale in neolithic Britain? It seemed so to me. The Neolithic Revolution began in the British Isles around 4000 BC. Did it take people almost 2000 years, until the Bronze Age, before they realised or discovered that it was possible to make malt and ale with the barley and wheat that they were so keen to grow? Was the Neolithic really a time of growing grain to make flour, bread, porridge and gruel? Or were they making sandwiches for the feasts, as Professor Mike Parker Pearson seems to be suggesting. Or maybe he is just making a joke?

a few words about brewing residues
When making ale from crushed malted grain, two types of sludgy cereal based residues are generated during the brewing process. The first is a sludge, rich in barley chaff from the sparging process. Freshly sparged wort is cloudy at first. 

freshly sparged wort - settling out
the same wort, settled out with sludgy cereal residues accumulated
Once you have a clear wort, it is racked or syphoned off into a fresh clean vessel. Some chaff will inevitably get through. Boil the wort with selected herbs, flowers or hops and then ferment it. You can use the barm from previous brews to start a fermentation, it is ideal. A simple process, once you know how to do it.

The second type of brewing residue is cereal based, but with traces of yeast and herbs, hops, flower heads, leaves, twigs or pollen that settle out during the fermentation of the wort in the fermenting vessel. If you are lucky enough to drink a bottle of traditionally made real ale, the kind that must be poured in one go so as not to disturb the sediment, then you will know roughly what I mean. 

cereal based residues on grooved ware buckets
Let's go back to the Balfarg excavation report. The pots in question were numbers 63 and 64. Sherds from these two large grooved ware bucket shaped pots were found in a pit, close by one of the rectangular timber structures. Brian Moffat's descriptions of the cereal based residues make interesting reading for any all-grain brewer or archaeologist. I recognised immediately what these residues represented when I read them, way back on that summer's day in 1997. Not a sort of porridge with added herbs. Not a kind of gruel. These cereal based residues were probably the remains of brewing sediments from the fermentation bucket.

I was so excited by this! Ale in the Neolithic! I ran round to my best friend's house, just round the corner from where I lived, and told her all about it. She is a biochemist and was just as excited as I was. I told my supervisor the next day. He did not seem impressed at the prospect of malt and ale in neolithic Scotland. The previous year I had a short article published in British Archaeology, so I contacted the editor. He asked me to send him some details so that he could include it in the News section, September 1997. The Getafix and magic potions reference was not my idea! I do like it, though.

the original descriptions of the residues on pots 63 & 64

pots 63 & 64 from Balfarg (PSAS Vol 123)
Three broad, yet distinct types of burned cereal based residues were identified on the inside surface of sherds:
1. amorphous & burned
2. amorphous, granular & burned 
these two types were abundant in all samples.

3. burned cereal mash
both barley & oats, part grains, there was no entire carbonized grain since the grain had been thoroughly ground down, making taxonomic identification difficult.

"... a cereal based preparation ... with meadowsweet, indicated by both pollen & macroplant remains, clumps in one sample indicate a flowerhead was added ... fat hen ... cabbage/mustard? ... the single record of nightshade is puzzling ... pollen from hemlock ... the mix is coarse and crude ... like course porridge with potherbs and flavourings"

Another burned deposit was encrusted on the outer surface of one sherd of Pot P63. Both pollen and seeds of black henbane were identified.  
"... the seeds are robust and resilient and the breaks show mechanical rendering ... pollen and seed fragments were fairly well intermixed suggesting an incomplete process of homogenization ... the small cache of seeds is of black henbane alone."

Two separate organic residue deposits. One inside the pots, this one was cereal based with several different herbs added. The other residue was a burnt encrustation on the outside surface which, when first analysed, contained henbane pollen and several henbane seeds.
burnt encrustation on the outside of Pot 63 that contained henbane pollen and seeds

The above photo is from the booklet "Balfarg. The Prehistoric Ceremonial Complex" published by Fife Council, Glenrothes Development Corporation and Historic Scotland, 1993. I think it was intended as a guidebook for the site and is now out of print. There may be secondhand copies available. The original archaeobotanical report of the Balfarg residues is on pages 108-110 in Proceedings of the Society of Antiquaries of Scotland, Vol 123.

Henbane (hyoscyamus niger)
According to Culpepper, henbane should never be taken internally. More modern herbal reference books warn that it is a deadly poisonous plant. Do not use. This is very good advice. However, henbane does have its' place as a herbal remedy that was sometimes used in historical times, for example, to alleviate earache if applied externally, as a tincture. If consumed in small quantities, henbane induces intoxication, hallucinations, blurred vision, rapid heartbeat, euphoria and dizziness.

It is an effective painkiller, according to the herbal literature. All parts of the plant can be used and the seeds are about ten times more potent than the leaves or flowers. I am sure that, in the Neolithic, people knew about the medicinal and other properties of the henbane plant. It grows well in coastal regions and henbane seeds were identified at Skara Brae, a neolithic village in Orkney, Scotland. An intriguing aspect of the plant is that the active ingredients, the alkaloids, are more soluble in alcohol than in water.

henbane (hyoscyamus niger)

so what's the controversy?
This appeared to be not about the cereal based residues, but rather about the unusual identification of henbane seeds in the burnt encrustation on the outside surface of a neolithic pot sherd. It seems that, at first, there was not a problem. The excavation report, with its' rather interesting archaeobotanical report, sat quietly in the library journal section for a few years. It did not make any trouble. As more things were written about it, and as more archaeologists made reference to the possible "ritually charged" aspects of this rare residue discovery, it seemed that a re-analysis was required. This was commissioned by Historic Scotland. Two academic papers were rapidly produced.

The first was published in January 1999 in the Journal of Archaeological Science. This is a pay to view paper, with access available through University Libraries. Although the existence of henbane seeds within the residue was not confirmed, the residue was described as "a uniform and well processed substance, possibly something like a thick carbohydrate or protein based gruel". This description is consistent with the sludgy residues that accumulate at the bottom of an ale fermentation vessel - a well processed homogeneous mixture of cereal chaff, pollen, plant fragments and seeds.

The second paper was published in March, 2000 in Antiquity. This one, happily, is accessible online and is essentially a summary of the first paper. The focus is on disproving the "henbane ale" theory. The abstract makes this clear: "Were drugs in use in prehistory? Recent claims for the use of hallucinogenic substances have been made, and caused a stir. However, new work on a Scottish Neolithic ceremonial site suggests archaeologists (and the media) may have been jumping to the wrong conclusions!"

Whether or not henbane was added to the ale is clearly debatable. If such plants were being added to the brew, then it infers an understanding of their properties and some interesting ritual practices in prehistory. It might infer shamanistic practices, witchcraft, medicinal use of plants and more. A paper has been published recently in the Journal of Archaeological Method and Theory by Elisa Guerra-Doce of the Universidad de Valladolid in Spain. She argues that "far from being consumed for hedonistic purposes, drug plants and alcoholic drinks had a sacred role among prehistoric societies. It is not surprising that most of the evidence derives from both elite burials and restricted ceremonial sites, suggesting the possibility that the consumption of mind-altering products was socially controlled in prehistoric Europe."

My interest is in the cereal based residues on these ancient grooved ware pots and what they tell us about cereal processing techniques in the Neolithic. Flour, bread, porridge, gruel or was it malt and ale? What were they drinking at feasts? Was it sacred river water, or was it sacred ale? When searching for an image of grooved ware pottery online I found this comment on that well known online Encyclopedia - Wikipedia:

"Grooved ware comes in many sizes, some vessels are extremely large, about 30 gallons, and would be suitable for fermentation. The majority are smaller, ranging from jug to cup size, and could be used for serving and drinking. The theory that the first British farmers (c4000 BC) had the knowledge and ability to make ale from their crops with their pottery appears to be controversial and not yet widely discussed by the archaeological community."

There have been some amazing recent archaeological excavations and discoveries of ancient ceremonial and feasting sites, for example the Ness of Brodgar on Orkney and Durrington Walls, near Stonehenge in England, which was investigated by the Stonehenge Riverside Project. There is also evidence for beer brewing and feasting at Gobekli Tepe in Turkey, at the dawn of agriculture, some twelve thousand years ago.

It is surely time for the academic community to start talking seriously about how grain was being processed in prehistory. What were they were using it for? The options seem to be flour, bread, porridge, gruel or malt and ale, with added herbs.

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Balfarg Excavations
Balfarg was excavated before the construction of a housing estate. As a result, plans were altered to preserve the stones and build the houses around them. The excavation reports are online, thanks to the Archaeology Data Service, York University, so you can read it for yourself from the comfort of your own desk or armchair: Barclay, G J & Russell-White, C J (eds) 1993 'Excavations in the ceremonial complex at Balfarg/Balbirnie, Glenrothes, Fife' Proceedings of the Society of Antiquaries of Scotland Vol 123, 43-210.

Balfarg had been excavated earlier, in the 1970s. During those excavations a cist burial was found, containing the bones of an adult together with a dagger and a fine beaker with a handle - a rare find indeed. This excavation, by Roger Mercer, was published in 1981: The excavation of a late neolithic henge-type enclosure at Balfarg, Markinch, Fife, Scotland 1977-1978. Proceedings of the Society of the Antiquaries of Scotland Vol 111, 63-171.