Braise onions, celery and green pepper in 2 tablespoons of oil.
In a separate pot mix 4 tablespoons of oil with flour. Brown well to make a French roux. Add water, bay leaves, ketchup, garlic, red and black pepper, Worcestershire sauce and Tabasco sauce to vegetable mixture. Salt to taste. Cook gently until vegetables are done and flavors well blended.
Add okra, tomatoes, shrimp and crab. Thicken with roux and simmer briefly, adding water as needed, until the seafood is done. Add gumbo file and serve over rice.Makes 6 Source: