1 pound flounder or haddock fillets -- - fresh or frozen
1 tablespoon butter or margarine
4 teaspoons lemon juice
1 teaspoon lemon rind -- grated
1/8 teaspoon salt
1/8 teaspoon pepper
1/8 teaspoon rosemary
Thaw frozen fish. Preheat oven to 350F (moderate).
Divide frozen fish into 6 servings. Place in single layer in a baking pan. Mix fat, lemon juice, lemon rind, salt, pepper, and rosemary. Pour over fish.
Bake for 25 minutes or until fish flakes easily when tested with a fork.