Rocky mountain oysters or mountain oysters, or meat balls, also known as prairie oysters in canada (french: animelles), is a dish made of bull testicles. the organs are often deep-fried after being skinned, coated in flour, pepper and salt, and sometimes pounded flat. this delicacy is most often served as an appetizer.the dish is served in parts of canada, where cattle ranching is prevalent and castration of young male animals is common. "prairie oysters" is the preferred name in canada where they are served in a demi-glace. in oklahoma and the texas panhandle, they are often called calf fries. in spain, argentina and many parts of mexico they are referred to as criadillas, and they are c...

Source: Wikipedia