Mix all ingredients together in a bowl until well combined. Use immediately on pork roast, or store spice rub in an airtight container until ready to use. This pulled pork rub will stay good for more than 6 months if stored in a cool, dark place like a cupboard. Discard any leftover rub that has come into contact with raw meat. This recipe makes enough pulled pork rub for 1 large pork roast. Double, triple, or even quadruple the recipe to suit your barbecue needs.