Gumbo Filé Spice is a blend of thyme and ground sassafras. This spice has origins in the United States and is primarily used in Creole and Cajun dishes, and as a culinary thickener. It tastes good in soups, fish, poultry, game, meat and vegetable stews. Usually filé powder is added after the dish is removed from the heat, but while the liquid is still near boiling then it is stirred in and blended thoroughly. Be sure not to boil after powder has been added or it can turn stringy.