01 - Remove the membrane from the underside of each rack of ribs to enhance tenderness.
02 - In a small bowl, thoroughly mix all spice rub ingredients until uniform.
03 - Generously coat both sides of each rack with the spice rub. Allow to sit at room temperature for 20 minutes to develop flavor.
04 - Preheat a gas or charcoal grill to medium indirect heat, approximately 285–320°F.
05 - Tightly wrap each rack in aluminum foil, adding a splash of apple cider vinegar inside each foil packet to retain moisture.
06 - Position the foil-wrapped ribs on the grill, cover, and cook for 1 hour 30 minutes, turning occasionally for even cooking.
07 - Carefully unwrap the ribs and brush both sides generously with barbecue sauce.
08 - Return ribs without foil to the grill over direct medium heat. Grill for 10–15 minutes, turning and basting with additional barbecue sauce, until the exterior is caramelized and slightly charred.
09 - Allow the ribs to rest for 5 minutes before slicing between the bones for serving.