Use an iron pot if possible. Heat cooking oil. Add flour and brown to a dark brown over a low fire. Be certain to keep stirring this mixture constantly. If the phone rings, do not answer. Add chopped seasoning; simmer over low heat about 1 hour.
Season crawfish tails with salt, black pepper and red pepper and add to sauce mixture. Cover and continue to simmer over low heat for about 1 more hour. Serve over rice.