I don't think I ever followed up on this... we had a small harvest this season from the American hazelnut hedge (just a few years old). I posted a picture of the nuts in their shells a little while ago, but here they are shelled out. We roasted them all. They're a little on the small side and strongly-flavored probably because off the skins which don't come off very easily. Even so they're still worth the trouble. Looking forward to heavier harvests as the hedge gets more mature.