"Beer is proof that God loves us" Benjamin Franklin

Actually the definition of beer is a fermented beverage made from grain. Yes one can also ferment starchy liquids but you will need to supply amylase enzymes (present in malted barley and wheat) that is why the ladies must chew the corn (amylase is also in saliva) to start the process of making Chicha. But if it is made of potato etc. with out grain it is not truly beer. Although there have been commercial potato beers on the market but the potato was an adjunct to the base recipe of malted barley.
I used to teach beer education at a beer company as well as a beer judging course. Yes I got PAID to drink beer at one time. Norm eat your heart out.
Bill

PS. Sierra Nevada Celebration is out again! This one is my very favorite!