01 -
Pat ribs thoroughly dry with paper towel and set aside.
02 -
In a small bowl, combine brown sugar, salt, paprika, garlic powder, black pepper, and mustard powder. Evenly coat both sides of the ribs with the dry rub, pressing gently to adhere.
03 -
Distribute chopped onion evenly across the bottom of a 6-litre slow cooker, then add water.
04 -
Place ribs in the slow cooker, stacking as needed. Brush half the barbecue sauce over the top of the ribs to coat.
05 -
Cover and cook on LOW for 8–10 hours or on HIGH for 4–6 hours, until meat is tender and easily comes away from the bone.
06 -
Serve ribs immediately with remaining barbecue sauce.
07 -
For a crisp, caramelized exterior, transfer ribs onto a parchment-lined baking tray, baste with extra sauce, and broil on the top rack at high heat for 5–7 minutes until browned.