To catch up the uncultured, a Rocky Mountain or Prairie Oyster (a.k.a. calf fry, a.k.a. the original "sack lunch") is a bull's (or sheep's) testicle skinned, sliced, pounded (ouch!), and deep-fried. Usually served with cocktail sauce, a nut is a great appetizer while you're waiting for Cookie to slap your cow on the hind end and send her to you on a plate garnished with a candied apple ring.