shrimp etouffee recipe

hrimp Étouffée Ingredients: 2 pounds shrimp, peeled and deveined 1/2 cup butter 1/2 cup all-purpose flour 1 onion, finely chopped 1 green bell pepper, finely chopped 2 celery stalks, finely chopped 4 cloves garlic, minced 2 cups seafood or chicken broth 1 can (14.5 ounces) diced tomatoes