Start by removing any large chunks of fat that have still remained through the butcher and packing process. Remove any silverskin that might remain as well. If this is a full rack of spare ribs, cut it down to more manageable-sized pieces. If you have a smaller pellet grill, make sure it will fit on your rack.
Sprinkle with rub seasoning and massage it in. Make sure to work it into both sides as well as the edges.
Preheat pellet grill or smoker to 225°F
Cook the ribs on the grill for 3 hours.
Remove ribs from the grill, wrap them in foil or butcher paper adding a tablespoon of apple cider vinegar. Place back on the grill and cooked wrapped for another 2 hours.
Unwrap the ribs and cook on the grill for another hour.
Remove from grill. Rest for 20 minutes covered. Then serve and enjoy!