01 - Peel off the membrane from the back of the ribs if present to ensure better tenderness and spice penetration.
02 - In a small bowl, combine the brown sugar, paprika, smoked paprika, garlic powder, onion powder, black pepper, salt, and cayenne pepper until evenly blended.
03 - Generously coat both sides of each rack with the spice rub, pressing firmly to adhere. Allow the ribs to rest at room temperature for 20 minutes.
04 - Set up a charcoal or gas grill for medium indirect heat, targeting 285–320°F. Let the grill stabilize before adding the ribs.
05 - Wrap each rack tightly in aluminum foil, adding a splash of apple cider vinegar inside each packet. Place the foil-wrapped ribs on the indirect heat zone, cover the grill, and cook for 1½ hours, turning occasionally.
06 - Carefully remove the ribs from the foil. Brush generously with barbecue sauce and return the unwrapped racks to the grill over direct medium heat. Grill for 10–15 minutes, turning and basting with additional sauce until caramelized and lightly charred.
07 - Transfer the ribs to a cutting board and let rest for 5 minutes before slicing between the bones. Serve with your favorite sides.