Put 4 tbsp of barbecue sauce along with the rest of the ingredients into your slow cooker. Top up with enough water to cover (roughly 1.5l). Slow cook on Low for 8 - 9 hours until very tender but not completely falling off the bone.
Heat the oven to 220C/ 200C fan/ gas mark 7. Remove the ribs from the slow cooker using a slotted spoon or tongs. Handle them carefully as the meat will be very tender and may start to fall off. Baste with the remaining barbecue sauce and lay on a foil-lined oven tray. Cook for 20 – 30 mins until starting to crisp on outside. Alternatively, cook on the barbecue, turning from time to time until piping hot throughout.
Get aheadYou can cook this in the slow cooker the day before, baste in barbecue sauce, cover and refrigerate before oven-cooking or barbecuing.