Trim any excess fat off the roast and place it in a slow cooker with the beef stock.
In a blender, combine vinegar, onion, lime juice, garlic, cumin, oregano, black pepper, salt, cloves, allspice and desired number of chilis and puree. Pour the pureed sauce over the meat.
Cook on low heat for 8-10 hours or high heat for 6 hours. Don't peek while cooking!
Shred the meat in the juices and serve warn.
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