1⁄3 cup each ketchup, rice vinegar and soy sauce
2 racks bone-in spareribs, about 4 1/2 lb (2 kg)
1. In a bowl, whisk seasoning with soy sauce, rice vinegar and ketchup. Cut ribs into serving-size portions. Wrap in foil and place on a sheet pan. Roast in preheated 350°F (180°C) oven for 1 1⁄2-2 hours.
2. Open foil and coat generously with sauce. Roast for an additional 20-25 minutes or finish on the BBQ over medium-high heat for 10-15 minutes.