Gumbo is a stew made with a spiced, darkened roux and a variety of meats, poultry, or seafood. It starts with the "holy trinity" of vegetables: onions, celery, and bell peppers. Gumbo may contain one or more of the following: andouille sausage, polish sausage, chicken, duck, shrimp, crab, or oysters. It is often served with rice.