01 - Rinse the rice under cold water until the water runs clear. In a medium saucepan, bring 3 cups water, 1/2 teaspoon salt, and 1 tablespoon butter to a boil. Stir in the rice, reduce to a simmer, cover, and cook for 15-18 minutes, or until all water is absorbed and rice is tender. Remove from heat and let rest, covered, for 5 minutes. Fluff with a fork.
02 - In a large, heavy-bottomed skillet or Dutch oven, melt 1/2 cup butter over medium heat. Add flour and cook, stirring constantly, to make a medium roux (light brown color), about 5-7 minutes.
03 - Add onion, bell pepper, and celery to the roux. Sauté for 5 minutes until softened. Stir in garlic and cook 1 minute more.
04 - Add drained diced tomatoes, Creole seasoning, cayenne, paprika, and bay leaf. Stir to combine. Gradually add stock, stirring to avoid lumps. Bring to a simmer. Add Worcestershire sauce. Simmer gently, uncovered, for 15 minutes, stirring occasionally.
05 - Stir in crawfish tails and simmer for 5-8 minutes, until heated through. Remove from heat. Add lemon juice, half the parsley, and half the green onions. Season with salt and pepper to taste.
06 - Spoon fluffy white rice onto plates or bowls. Ladle crawfish étouffée over rice. Garnish with remaining parsley and green onions.