Seafood Gumbo

Ingredients

• 1/2 cup chopped onion
• 1/2 cup chopped green pepper
• 1/2 cup sliced fresh mushrooms
• 1 garlic clove, minced
• 2 tablespoons margarine
• 1 (28 ounce) can whole tomatoes, undrained
• 2 cups chicken broth
• 1/2 teaspoon ground red pepper (more to taste)
• 1/2 teaspoon dried thyme leaves
• 1/2 teaspoon dried basil leaves
• 1 (10 ounce) package frozen cut okra, thawed
• 3/4 lb white fish, cut into 1-inch pieces
• 1/2 lb peeled deveined shrimp
• 3 cups hot cooked rice