seafood gumbo recipe

**Ingredients:** - 1/2 cup vegetable oil - 1/2 cup all-purpose flour - 1 large onion, finely chopped - 1 green bell pepper, finely chopped - 2 celery stalks, finely chopped - 3 cloves garlic, minced - 6 cups seafood or chicken broth - 1 can (14.5 ounces) diced tomatoes - 1 cup sliced okra (fresh or frozen) - 1 tablespoon Cajun seasoning - 1 teaspoon dried thyme - 2 bay leaves - 1 pound shrimp, peeled and deveined - 1 pound crab meat or crab claws - 1 pound firm white fish (such as cod or halibut), cut into chunks - 1 teaspoon salt - 1/2 teaspoon ground black pepper - 1/4 cup chopped fresh parsley - Cooked white rice (for serving)