Mix brown sugar, paprika, garlic powder, onion powder, cayenne, salt, and pepper.
Rub mixture all over the pork shoulder.
Place pork in slow cooker fat-side up.
Pour vinegar and broth around (not over) the meat.
Cook on LOW for 8-10 hours until meat pulls apart easily.
Remove pork and shred with two forks, discarding fat and bone.
For sauce: Whisk all sauce ingredients in a saucepan.
Simmer 10 minutes until slightly thickened.
Toss shredded pork with some cooking liquid and sauce.
Serve on buns with coleslaw and extra sauce.
💡 Tips & Notes
South Carolina is famous for its mustard-based BBQ sauce, unlike the tomato-based versions elsewhere. The vinegar in the cooking liquid helps tenderize the meat.