For The Crawfish Étouffée Fine dice your vegetables. In a large pan with a tight fitting lid - melt butter over medium high heat. Add chopped vegetables to pan and sauté until soft and translucent. About 10 minutes. Stir occasionally. Add small amounts of water if needed. Add your crawfish tails and seasonings, mix and cover tightly. Simmer for 5 minutes if using presteamed tails. Stir occasionally. Turn up your heat - add your water / flour mixture, mix well and simmer until desired thickness. About 3 minutes.