Preparation
Heat oil in heavy saucepan or casserole and saute onion garlic and peppers until the onion is soft.
Add the meat and the other ingredients except the tortilla.
The liquid should barely cover the meat. Add a little more stock if necessary.
Covered, simmer gently until the beef is tender, about 2 hours.
If using tortillas soak in cold water, and crumble like bread crumbs. Add to the casserole and simmer uncovered, until the sauce is thickened.
If using masa harina or cornmeal mix with a little cold water and stir into the stew, cooking just until the sauce is thickened.