1. Toast the dried chilies in a dry skillet over medium heat until fragrant, about 2 minutes.
2. Soak the toasted chilies in hot water for 20 minutes, then drain.
3. Blend the soaked chilies, onion, garlic, oregano, cumin, and black pepper with 1 cup of beef broth until smooth.
4. In a large pot, sear the beef chunks until browned on all sides.
5. Add the chili sauce, remaining beef broth, bay leaves, and salt to the pot. Bring to a boil, then reduce to a simmer.
6. Cover and simmer for 3 hours, or until the beef is tender and shreds easily.
7. Serve hot with tortillas, lime wedges, and chopped onions.