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Place the sliced onion in the bottom of the slow cooker. Rub the pork shoulder with the brown sugar, paprika, chili powder, cumin, salt, and pepper, then set it on top of the onions.
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Add the garlic, barbecue sauce, chicken broth, and apple cider vinegar.
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Cover and cook on low until the pork is fork-tender and easily shreds apart, usually 8–10 hours.
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Once cooked, shred the pork with two forks or meat shredding claws, return it to the juices in the slow cooker, and stir in extra barbecue sauce if desired. Serve on buns, over rice, or with your favorite sides.