Creole Gumbo

Name: Creole Gumbo
Ingredients: 4 small blue crabs, cooked; 1/8 cup clarified butter; 6 ounces onion, finely sliced; 1 ounce celery, finely sliced; 1 green pepper, finely chopped; 3 medium tomatoes, blanched, skinned, seeds removed, cut into quarters; 2 cloves garlic, smashed; 4 cups fish stock; 1 teaspoon tomato paste; 2 bay leaves; 1 pound oysters; 8 ounces tiny shrimp, cooked; 1 (12-ounce) can okra, okra pieces halved; 1 teaspoon freshly ground black pepper; 1 teaspoon file powder; 1/8 cup cold water