Roux - The Secret to Great Cajun Cooking: "Traditionally, Creole roux is used with lard or bacon fat, while Cajuns utilized butter. Modern-day Cajuns now use vegetable oil and it is usually cooked until the color appears copper to dark brown. However, some do use a light brown roux in their recipes. Cooking it until it reaches a dark brown color imparts a unique and rich flavor like no other to whatever dish is being prepared."
By Cayenne_Pepper