Rehydrate the Chiles:
In a bowl, soak the guajillo and ancho chiles in hot water for 10 minutes until softened. Drain and set aside.
Blend the Sauce:
In a blender, combine the softened chiles, chipotle pepper, onion, garlic, tomato, cumin, oregano, cinnamon, and apple cider vinegar. Blend until smooth, adding a little beef broth if needed for consistency.
Slow Cooker Method:
Season the Beef: Sprinkle the beef chunks with salt and pepper, and place them in the slow cooker.
Add the Sauce: Pour the blended sauce over the beef. Add the bay leaves and beef broth to cover the meat.
Cook: Set the slow cooker to low and cook for 8 hours, or until the beef is tender and falls apart easily.
Shred the Beef: Remove the bay leaves, discard them, and shred the beef with two forks. Stir the meat into the sauce to keep it moist.
Instant Pot Method:
Sauté the Beef: Set the Instant Pot to “Sauté” mode. Add a little oil, season the beef with salt and pepper, and sear on all sides.
Add Ingredients: Pour the blended sauce over the beef. Add bay leaves and beef broth.
Pressure Cook: Seal the lid and cook on high pressure for 45 minutes, followed by a natural release for 15 minutes.
Shred the Beef: Remove the bay leaves, discard them, and shred the beef directly in the pot. Stir it into the sauce for maximum flavor.
Heat the Tortillas:
Lightly toast the corn tortillas on a skillet or griddle. Assemble the Tacos:
Place shredded beef onto each tortilla. Sprinkle with shredded cheese and fold in half.
Crisp the Tacos:
In a skillet, heat a small amount of oil. Fry the folded tacos until golden and crispy on both sides.
Garnish:
Top the tacos with chopped cilantro, diced onion, and a squeeze of lime juice.
Dip and Enjoy:
Serve with a side of the beef birria consommé (the sauce from the slow cooker or Instant Pot) for dipping.