I have made acorn bread. You just grind them up the rinse them under water with a cloth for some time until it is not bitter anymore. Also, there are some varie

I have made acorn bread. You just grind them up the rinse them under water with a cloth for some time until it is not bitter anymore. Also, there are some varieties of acorns that have very low tannin, to the point that you don't even have to rinse them I believe.