01 - Remove the thin membrane from the back of each rib rack using a knife or fingers to peel it away. This step ensures better tenderness and flavor penetration.
02 - Combine brown sugar, paprika, smoked paprika, garlic powder, onion powder, black pepper, salt, and cayenne in a small bowl. Stir until thoroughly blended.
03 - Coat both sides of each rib rack generously with the spice mixture, pressing the rub into the meat. Let seasoned ribs rest at room temperature for 20 minutes.
04 - Prepare a charcoal or gas grill for medium indirect heat, maintaining a temperature between 285-320°F.
05 - Wrap each seasoned rib rack tightly in heavy-duty aluminum foil, adding 1 tablespoon of apple cider vinegar into each packet before sealing.
06 - Place foil-wrapped ribs on the grill over indirect heat. Close the lid and cook for 1½ hours, turning packets every 30 minutes for even cooking.
07 - Carefully remove ribs from foil. Brush both sides generously with barbecue sauce using a basting brush.
08 - Return unwrapped ribs to the grill over direct medium heat. Grill for 10-15 minutes, turning every few minutes and basting with additional sauce until the glaze caramelizes and develops slight char marks.
09 - Transfer ribs to a cutting board and let rest for 5 minutes before slicing into individual portions. Serve with additional barbecue sauce on the side.