This recipe for red Creole crawfish gumbo is about as authentic as it gets. The holy trinity of vegetables is combined with filé powder and a homemade roux to get that true, Creole flavor. Don't be frightened by the long list of ingredients; this recipe can be made in about an hour and a half. Try to get extra fresh crawfish for the best flavor, either whole or just the tails. If you can't find fresh, frozen should work just fine-but be sure to either thaw them beforehand or increase the cooking time.