NYT Cooking: Lucy Buffett and her famous brother, Jimmy, grew up in Mobile, Ala., where seafood from the Gulf of Mexico is a key player in the culinary canon. Mr. Buffett went on to a giant career in music. His sister Lucy opened the freewheeling LuLu’s restaurant in Gulf Shores, Ala. When they were children, oyster stuffing was always on the Thanksgiving table. And it still is. “Usually, it’s all gone by t...