Acorns are the fruit of the oak tree. Some varieties are edible and, like chestnuts, may be eaten raw, roasted or baked. They may also be ground and used as a coffee substitute.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.