Acorns are the fruits of oak trees and can be eaten. Acorn is the fruit of an oak tree, which looks like a cocoon, so it is also called chestnut cocoon. Oak has a hard shell, reddish brown, peanut kernel, rich in starch, and the content is about 60%. It can not only be eaten, but also be used as raw material for sizing in textile industry.

Acorns are edible. However, some acorns (especially black acorns from red oak) contain a lot of tannins, which will be bitter if eaten directly without treatment. The green acorn of white oak has low tannin content and sweet taste, which can be eaten raw or cooked. The basic practice of acorns is to cook for a long time and change water to remove tannins contained in them. You can eat it directly after cooking. Acorns can also be baked or mixed with flour, and acorn powder often has a special flavor. Because acorns contain more oil, acorn powder must be carefully stored to avoid damage. Acorn powder can also be used as a coffee companion.