Place pork and onion in the slow cooker. Combine the rest of the ingredients and pour over the roast. Cover and cook on low 10 hours or until fork-tender.
Remove roast to plate and use two forks to pull the pork into small pieces. Return to the sauce and serve.
Hack: Store leftovers in the refrigerator for up to 5 days. Freeze serving-sized portions in freezer bags or containers for up to 3 months.