Can you eat oak tree acorns?

Yes, but they contain Tannic Acid, which upsets your stomach. To get rid of the Tannic Acid, Toss the nuts into a large pot, and cover them with plenty of water. Bring to a boil and continue boiling for about 15 minutes. The water will turn brown as the tannic acid is extracted from the kernels. Throw out the water and replace it with fresh water. Re-boil the acorns, throwing out the brown water several times until the water is clear. The boiling process takes about two or three hours, though the time varies with the amount of tannic acid in the acorns. When you are finished, the acorns will no longer taste bitter and will have turned a darker brown. The nuts have a flavor similar to boiled chestnuts. Unless you want to use them wet, you need to dry out the nuts. Spread them out on cookie sheets and roast them in an oven at about 200 degrees F for an hour. You can eat the roasted nuts or chop them up to use as you would any chopped nuts. They can be dipped in sugar and eaten as candy.