Gumbo file' powder is made by harvesting the young leaves and stems of the sassafras tree and grinding them. Sprinkled over gumbo as a seasoning and a thickening agent, filé powder adds a distinctive, earthy flavor and texture. Bolner's Fiesta has been a trusted regional brand since 1955 The perfect addition to your homemade gumbo, our Gumbo File' is made from the highest quality ground Sassafras leaves and spices. Ingredients: Ground Sassafras and Spices. No MSG and Gluten-Free. Bolner's Fiesta Brand is the mark of quality for spices and seasonings. Our products are selected from the finest spice producing centers of the world. Only the best is packaged under the Bolner's Fiesta Brand trademark.