A couple handfuls of hickory wood chips, soaked for at least 30 minutes (optional)
1 cup prepared pbfit peanut butter barbecue sauce
Place all of the dry rub ingredients in a small bowl, mixing to combine.
Using a sharp knife, remove any silver skin on the back of each rack of ribs. Use a knife to release an edge, and then pull it off with a paper towel.
Coat each rack of pork ribs evenly with the rub, then wrap tightly with 2 to 3 layers of foil. As you are wrapping, be careful not to pierce the foil with the ribs.
Preheat a charcoal or gas grill to medium heat. Cook ribs covered over direct heat for 1 hour, turning twice to ensure even cooking. Maintain between 350°F–400°F within the covered grill.
Take the ribs off the heat and let rest for 10 minutes. Remove the foil and discard any liquids. Meanwhile drain the hickory chips (if using) and scatter over the coals or add to the smoker box of a gas grill.
Once smoking, return the ribs to the grill (bone side down) and using a brush, baste the top of the ribs with barbecue sauce.
Cook covered for 10–12 minutes until glaze is charred in spots. Flip the ribs and baste twice during this time period.
Let rest for 5 minutes before serving. Be sure to serve some extra barbecue sauce on the side.