Chorizo is a highly-spiced pork sausage used in Mexican and Spanish cooking. Garlic and chili powder flavor the coarsely-ground pork.
Kidney beans can be used in place of the black beans.
Southwestern-style stewed tomatoes can be substituted for the Mexican stewed tomatoes.
To keep the casserole warm at the table, place the dish in an insulated casserole holder. Serve the spicy casserole with warm tortillas and sour cream.