Combine the brown sugar, chilli powder, salt, 1 black pepper, the oregano, cayenne, garlic powder and onion powder in a small bowl and rub the mixture on both sides of the ribs. Cover and refrigerate 1 hour or overnight.

Preheat oven to 121°C

In a roasting pan, combine stock and vinegar. Add ribs. Cover pan tightly with foil. Bake 2 hours. Transfer ribs from pan to a platter. Pour liquid from pan into a saucepan; bring to a boil. Reduce heat; simmer 5 minutes or until reduced by half. In a large bowl, combine reduced liquid and barbecue sauce

Pre-heat grill to medium-high

Grill ribs 5 minutes on each side or until browned and slightly charred. Add ribs to bowl with barbecue sauce mixture; toss to coat. Serve hot.