Chef's Notes: Celebrate Mardi Gras—or spice up any old Tuesday of the year!—with this classic Creole étouffée from chef Justin Devillier. The dish starts with a simple roux, which is the backbone for “smothering” the crawfish in a traditional New Orleans preparation. (Note: If crawfish isn't readily available where you are, chicken, shrimp, and crab also work well!)