Cajun Crawfish and Shrimp Étouffée

Name: Cajun Crawfish and Shrimp Étouffée
Ingredients: 1/3 cup vegetable oil; 0.25 cup all-purpose flour; 1 small green bell pepper, diced; 1 medium onion, chopped; 2 cloves garlic, minced; 2 stalks celery, diced; 2 medium fresh tomatoes, chopped; 2 tablespoons Louisiana-style hot sauce; 1/3 teaspoon ground cayenne pepper; 2 tablespoons seafood seasoning; 0.5 teaspoon ground black pepper; 1 cup fish stock; 1 pound crawfish tails; 1 pound medium shrimp, peeled and deveined