Physical: Ground Category: Seasoning Description: Gumbo File is a spice made from dried and ground sassafras leaves. It is used in making gumbos of the Cajun and Creole type and is utilized primarily as a thickener. When ground, the sassafras leaves have a citrus like aroma and in addition to adding thickness, it infuses a distinctive flavor you will love. Application: Seafood, Stews, Chicken. Gumbo File/Sassafras is also used in a thickening agent called file powder and is a most often used in gumbo where the powder develops a mucilaginous quality when added to American, Cajun, Canadian, Creole, North American. The flavor of root beer and that of eucalyptus.