Beech Nuts

As a commercial food crop beechnuts are mainly processed to extract the oil, which is then used as a flavoring for chewing gum. They are also used as livestock feed. The nut can be safely eaten raw, despite that it is very mildly toxic, containing Saponic glycoside, which breaks down when the nut is roasted or otherwise processed. It doesn't taste like much raw, though, so should be roasted.