Take the top off the acorn by gently pushing it up. Under that cap is the soft center of the nut. Use your knife blade to gently remove the nut meat from the shell. Sometimes a wooden tooth pick helps pick it out. Try not to enlarge the hole any bigger that the round center of the nut. Keep in mind that you do not eat the nut meat of an acorn. Its bitter and will give you one heck of a belly ache.