Soak the dried chilies in hot water for 15 minutes until soft.
In a blender, combine softened chilies, garlic, onion, cumin, oregano, black pepper, and 1 cup of beef broth. Blend until smooth.
In a large pot, heat a little oil over medium heat. Add the beef chunks and sear until browned on all sides.
Pour the chili sauce over the meat and stir to coat evenly.
Add the remaining beef broth and salt to taste. Bring to a boil.
Reduce heat, cover, and simmer for about 2.5 hours or until the meat is tender.
Once cooked, shred the beef with two forks and return it to the pot.
Warm the corn tortillas on a skillet over medium heat.
Assemble the tacos by placing shredded beef on the tortillas.
Top with chopped cilantro, onion, and a squeeze of lime.