The following day, preheat oven to 160°C. Line a large baking tray with two sheets of slightly overlapping foil which comes approximately 5cm up the sides.
Line with a sheet of baking paper. Increase oven temperature to 200°C. Line a large baking tray with baking paper and place a wire rack on top.
Place the reserved marinade in a small bowl.
Stir in 2 tablespoons of the rib cooking juices, to make a glaze.
Remove ribs from bag, retaining excess marinade, place on prepared tray. Add 1/ 3 cup (80ml) of water.
Cover ribs with a sheet of baking paper.
Cover tray with foil folding and pinching tightly around the edge to seal.
Cook in the oven for 1 hour, or until tender.