Preheat grill to 300 degrees. Place ribs atop a double layer of foil, then rub both sides with char sui bbq sauce. Wrap tightly in foil.
Place on grill and cook for about 2.5 hours, until tender but not quite fall off the bone. Carefully unwrap and glaze with char sui bbq sauce. Remove ribs from foil and return directly onto the grill for another 10-15 minutes, until sauce is caramelized.
Transfer ribs to a cutting board and let rest. Cut ribs and garnish with peanuts, scallions, and cilantro.
