Good catch on the minerals. Potatoes also have vitamin C, but I think chuño loses it (vitamin C is rather fragile, odds are it doesn’t survive the process). Protein-wise I just checked it; 3% in potatoes, 8~12% in wheat.

I suppose if I ever go back, I might try chicha again. Was really unimpressed the last couple times I tried it, heh.

It’s a lot like grain beer, in the sense taste varies wildly, depending on a thousand things. For example, I had a friend from the region sharing his homemade chicha with me once; it was quite sweet and sour, but barely any alcohol. But when I tried my hand at it, the result was way sharper, and way stronger than grain beer.