Put oil in a heavy pot and add flour. Over medium-low heat stir constantly until it browns to the color of coffee; cook slowly.
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When roux has browned add celery, onions, and green peppers. Cook until wilted, add tomatoes, water, salt and pepper to taste and bring to a boil. After it is brought to a boil, add the okra lower the heat and cover and simmer for 45 minutes. Check the water level and make sure there is a good consistency, otherwise add a little more water and then add shrimp and crab. Cook an additional 30 minutes. Turn off the stove and add 1/2 to 1 teaspoon file. Serve