Burrida (Sardaigne)

Burrida is a Sardinian technique of serving fish such as skate, smooth hound shark, or dogfish (or any firm-fleshed fish). The fish are sliced and simmered in a broth flavored with celery, carrot, onion, and lemon. Afterwards, for the Cagliari version, the fish is dressed with a sauce consisting of garlic cooked in olive oil, walnuts or pine nuts, parsley, and vinegar. After the fish have absorbed the sauce for a few hours, burrida is served as an appetizer, always cold. There's also a version from Oristano, which is basically the same, but it's made with tomato sauce instead of nuts and vinegar from the Cagliari version.