Recipe courtesy of One Pot, From the Kitchens of Martha Stewart
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Heat a braiser or medium Dutch oven over medium. Add oil and flour; cook, whisking constantly, until golden brown, 5 to 7 minutes. Add onion, galric, clelery, and bell pepper; cook until crisp-tender, about 7 minutes. Add cayenne and ½ teaspoon salt.
Stir in tomatoes (with their liquid), the water, and sausage. Bring to a boil, reduce to a simmer, and cook, partially covered, until slightly thickened, about 25 minutes. Add okra and simmer 3 minutes. Add shrimp and cook until opaque, 3 to 4 minutes more. Season with salt.