Louisiana Crawfish Etouffee

INGREDIENTS

• 3 cups long grain white rice
• 6 cups water
• 3/4 cup butter
• 1 large onion, chopped
• 1 clove garlic, chopped
• 1/4 cup all-purpose flour
• 1 pound crawfish tails
• 2 tablespoons canned tomato sauce
• 1 cup water, or as needed
• 6 green onions, chopped
• salt and pepper to taste
• 1 1/2 tablespoons Cajun seasoning, or to taste