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To make the sauce combine vinegar, lime juice, chipotles, adobo sauce, garlic, cumin, oregano, black pepper, salt and cloves in a blender or food processor on high speed until smooth.
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Ensure all excess fat is trimmed off roast and cut into 6-8 pieces.
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Heat oil in a heavy skillet over medium high heat.
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Sear all sides of the meat to get a nice crust.
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Place meat in slow cooker.
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Cover with with sauce.
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Pour in broth and add bay leaves.
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Cover and cook 5 hours on high (or 8 hours on low).
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Remove the bay leaves.
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While still in the slow cooker, shred the meat with two forks and turn the heat to low and allow to cook for 1 more hour.