Porgy, also referred to as scup or bream, is a medium-fatty, firm-fleshed white fish with a mild flavor and edible skin. It takes very well to battering and frying, as in this recipe. If you can't find porgy, any medium-size, firm-fleshed white fish will work in this delicious recipe (skinned if desired). Buttermilk helps the cornmeal coating stick to the fish and keeps the fish moist, while seafood seasoning adds a nice kick. Ask your fishmonger to clean the fish and remove the heads and fins.