What is file powder?

File powder is a spice that is commonly used in Cajun and Creole cuisine. It is made from ground sassafras leaves and is frequently added to roux-based dishes such as gumbo and jambalaya. File powder has a slightly earthy and slightly sweet flavor. It also acts as a thickener for dishes, similar to cornstarch or flour. When added to soups or stews, it gives them a slightly thick and silky texture. However, it should be noted that file powder should be added at the end of the cooking process, as prolonged exposure to high heat can cause it to become stringy.