Toast chilies, cover with boiling water in a deep bowl and set aside for 20 minutes. Grind cumin, cloves, allspice, and oregano in a coffee grinder. Drain soaked chilies, puree Chillies in a blender, ground spices, thyme, garlic, onion, vinegar, and 1/2 cup of water.
Process mixture until it is smooth. Push mixture through a sieve, and season beef with salt and pepper. Rub paste all over the meat. Arrange in a bowl and allow the meat to marinate for four hours, refrigerated. Preheat the oven to 325 degrees.
Add meat and marinade to the pan.
Cover the pan with a lid or tightly with aluminum foil. Cook the beef 6 to 7 hours until meat is falling off the bone.
Recipe Tips
⏰ TIMING IS KEY: Never rush the marinating or cooking process - proper timing ensures the signature tender texture🔥 HOT SHRED TIP: Shred meat while hot for finer, more delicate pieces that better absorb the flavorful juices❄️ STORAGE SMART: Store leftover meat in larger pieces rather than shredded to maintain moisture and prevent drying