Soak the dried peppers in hot water for 10-15 minutes to soften.
Blend the softened peppers, tomatoes, onion, garlic, and vinegar until smooth. Add oregano, thyme, cumin, pepper, and salt.
Rub the beef with the spice marinade and let it rest for at least 2 hours (ideally overnight).
In a large pot, sear the meat over high heat for 5 minutes on each side to brown.
Pour in enough water to cover the meat, then simmer over low heat for 3-4 hours, or until tender.
Remove the beef from the broth and shred it with two forks.
Warm the tortillas in a skillet, then fill with the shredded beef and sprinkle with fresh cilantro, onion, and grated cheese (if using).
Dip the tacos in the beef broth when serving, and squeeze fresh lime juice over them.
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