Bronze Age Irishmen were as fond of their beer as their 21st century counterparts, it has been claimed.
Declan Moore and Billy Quinn have an ancient beer theory
Two archaeologists have put forward a theory that one of the most common ancient monuments seen around Ireland may have been used for brewing ale.
Fulacht fiadh - horseshoe shaped grass covered mounds - are conventionally thought of as ancient cooking spots.
But the archaeologists from Galway believe they could have been the country's earliest breweries.
To prove their theory that an extensive brewing tradition existed in Ireland as far back as 2500BC, Billy Quinn and Declan Moore recreated the process.
After just three hours of hard work - and three days of patiently waiting for their brew to ferment - the men enjoyed a pint with a taste of history attached.
Three hundred litres of water were transformed into a "very palatable" 110 litres of frothy ale.
The archaeologists are producing their fourth batch of beer
"It tasted really good," said Mr Quinn, of Moore Archaeological and Environmental Services (Moore Group).
"We were very surprised. Even a professional brewer we had working with us compared it favourably to his own.
"It tasted like a traditional ale, but was sweeter because there were no hops in it."
Mr Quinn said it was while nursing a hangover one morning - and discussing the natural predisposition of all men to seek means to alter their minds - that he came to the startling conclusion that fulachts could have been the country's earliest breweries.
The two archaeologists set out to investigate their theory in a journey which took them across Europe in search of further evidence. On their return, they used an old wooden trough filled with water and added heated stones.
After achieving an optimum temperature of 60-70°C they began to add milled barley and approximately 45 minutes later simply baled the final product into fermentation vessels.
The men have since made two more batches of beer - the second was stronger and the third was "a disaster" - but they have started work on batch number four which the hope will taste as good as their first.
The archaeologists' experiment is described in detail in next month's edition of the magazine, Archaeology Ireland.