A nice hot ale

Been reading about inns which had a pan of ale simmering on the fire, and people told me it would all be non-alcoholic but I can't see that

Some research on heating alcohol
https://www.winespectator.com/artic...about-foods-that-are-prepared-with-wine-52878
https://www.winespectator.com/articles/how-much-alcohol-in-mulled-wine-55825#

Plus, if people are coming in and drinking it, then it is continually being topped up from the barrel so it's continually having new alcohol added to it, to then slowly cook off.

Any thoughts or knowledge?
 
Are you referring to this phenomenon?

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