Also called Rocky Mountain oysters and prairie oysters, these are the testicles of an animal such as a calf, sheep or boar. Those from a younger animal are best. Mountain oysters can be special-ordered through most meat markets. They should be used as soon as possible, preferably within a day of purchase. Though they're not terribly popular in the United States, testicles are considered a delicacy in Italy and France. They can be sautéed, deep-fried, braised and poached.