Soak the dried peppers in hot water for 15 minutes until softened.
Drain the peppers and blend them with garlic, onion, cumin, oregano, and 1 cup of water until smooth.
In a large pot, heat some oil over medium heat and sear the beef and lamb on all sides.
Pour the blended sauce over the meat and add the bay leaf, salt, and pepper.
Cover the pot and let it simmer on low heat for about 2.5 hours or until the meat is tender.
Remove the meat from the pot and shred it with forks.
Strain the remaining liquid to create a flavorful consomé.
Warm the corn tortillas on a skillet.
Assemble the tacos by adding shredded meat and topping with cilantro.
Serve the tacos with a side of consomé for dipping.