Place the onions and garlic into the slow cooker.
In a small bowl, combine the brown sugar, paprika, salt and pepper. Coat the pork shoulder with the dry mixture and add to the slow cooker, on top of the onions and garlic.
Whisk together the vinegar, diluted Kitchen Accomplice Chicken Broth Concentrate or Chicken Bone Broth Concentrate, and Worcestershire. Pour the vinegar mixture over the pork.
Slow cook the pork on a standard setting for 4-6 hours.
Transfer the pork to a large bowl. Using forks, shred the pork and return it to the slow cooker.
Serve warm on slider buns.