In a large Dutch oven, brown the stew meat, onions, and peppers over high heat.
Sprinkle the flour over the meat and mix well. Add the beef stock and mix well.
Add the tomato sauce, garlic, cumin, chili powder, kosher salt, and black pepper. Stir well.
Bring to a boil, cover the Dutch oven, and reduce heat to low. Braise for 3 hours, or until meat is tender.
Serve with tortillas, sour cream, cilantro, and hot sauce.