Method
- Pat the 4 lbs pork shoulder completely dry with paper towels; a dry surface helps the spice rub stick and helps the meat brown better if you sear it.
- In a small bowl, mix the 1 tablespoon salt, 1 tablespoon brown sugar, 1 tablespoon smoked paprika, 1 teaspoon garlic powder, 1 teaspoon onion powder, 1/2 teaspoon black pepper, and 1/2 teaspoon cayenne if using. Rub this mixture all over every side of the pork, pressing it into the meat with your hands.
- Scatter the sliced onion in an even layer on the bottom of a 6-quart or larger slow cooker; this keeps the pork from sitting directly in liquid and burning on the bottom.
- Set the seasoned pork shoulder fat-side up on top of the onions. Pour the 1/2 cup chicken broth and 2 tablespoons apple cider vinegar around (not over) the meat so you do not wash off the rub.
- Cover with the lid and cook on LOW for 8 hours, or on HIGH for 5 hours. Do not lift the lid during cooking; each peek lets out heat and can add 15-20 minutes to the total cook time.
- The pork is done when it is fork-tender and shreds easily when pulled with two forks, and a meat thermometer inserted into the thickest part reads at least 195 F to 203 F (this higher temperature, well above the 145 F safe minimum for pork, is what makes tough connective tissue melt into gelatin so the meat falls apart).
- Using two large forks or tongs, carefully lift the pork onto a large rimmed baking sheet or cutting board; it will be very hot and may fall apart as you lift it, so support it from underneath.
- Let the pork rest for 10 minutes, then discard any large pieces of fat or bone. Shred the meat into bite-sized strands using two forks, pulling in opposite directions.
- Skim excess fat off the top of the cooking liquid in the slow cooker with a large spoon, then stir the shredded pork back into the remaining onions and liquid to keep it moist.
- Stir in the 1 cup barbecue sauce until the pork is evenly coated; taste and add more sauce or a pinch of salt if needed.
- Pile the warm pulled pork onto the 8 hamburger buns and serve immediately with extra barbecue sauce on the side.
Tips
Cooking well past the 145 F safe minimum to 195-203 F is not a mistake; that extra time is what breaks down connective tissue and makes the meat shreddable rather than chewy.
If the sauce seems thin after shredding, transfer just the liquid to a saucepan and simmer on the stovetop for 5-10 minutes to thicken before stirring it back in.