I’ve been making roux since I began to cook our weekday meals in the second grade. In my family, a light golden roux was the base for pan gravy, which was the mandated accompaniment to mashed potatoes. Many years later, I learned about a darker version, which is the base for French brown sauces and traditional Creole dishes, such as Gumbo.
In my estimation, the ultimate Thanksgiving gravy depends on a properly made roux. It’s not difficult to produce and lends the gravy a roasted flavor dimension that can’t be obtained with a simple flour and water or cornstarch and water slurry.