Step 1 Heat the oil in a large heavy-bottom saucepan over medium-low heat. Add the salt pork and cook, stirring occasionally, until it gives up most of its fat and shrivels, about 5 minutes. Add the onion and garlic and cook until they are soft and fragrant, about 3 minutes. Add the flour, and stir to evenly coat the onion and pork. Stir in the chile and the cumin and then whisk in the broth. Bring to a bare simmer and cook, stirring frequently, for 30 minutes to thicken the sauce and cook out the flour flavor. (Stir the bottom of the pan to prevent the flour from sticking and burning.) Remove from heat. Season with one-half teaspoon salt and a pinch of pepper, or to taste. This makes about 4 cups sauce. Keep the sauce warm if using immediately, or cover and refrigerate up to 2 days. Warm the sauce before using.