In the process of doing some research into foods and beverages of the Middle Ages, I made a fascinating discovery. There may be some historical truth behind the beverage “Butterbeer” from the Harry Potter books and films. I am guessing that J.K. Rowling probably had heard of the old beverage called Buttered Beere, which was literally beer that had been flavored with butter and spices and served hot. I made some tonight using a white lager as a base and it turned out beautifully. I hope to do some more experimenting and see what kind makes the best buttered beer.
-Geoff
The Books are Taking Over... 
Oh! So it’s real!
Yes, and apparently alcoholic, at least the historical versions were. I have heard of people trying to make a modern version using cream soda or something so kids could drink it but this is the real thing, at least in the history books.