Red Meat Chili Enchiladas

Name: Red Meat Chili Enchiladas
Ingredients: 1/2 cup vegetable oil; 12 (6-inch) corn tortillas; 1/2 pound Red Meat Chili, shredded, recipe follows; 2 cups Chili Sauce, recipe follows; 10 ounces Jack cheese, shredded; 1 cup finely chopped white onion; 1/2 cup chopped cilantro leaves; 1 cup Mexican crema; 1 cup crumbled Cotija cheese; 3 white onions, quartered; 8 tomatillos, peeled and washed; 4 Roma tomatoes, quartered; 8 cloves garlic, peeled; 1/2 pound ancho chiles; 1/2 pound gaujillo chiles; 2 cups hot water, to soak chiles; 1 quart chicken stock; 1 tablespoon cumin seeds; 1 tablespoon coriander seeds; 1 tablespoon mustard seeds; 1/4 cup extra-virgin olive oil; 1 (2-pound) flank steak