grill, turning and brushing with the Plum Barbecue sauce 2 or 3 times, until done, about 25 to 35 minutes longer. Heat any remaining sauce and serve with the hens. ROAST CORNISH HENS: Heat the oven to 180ºC . Place the cut hens, bone sides down, on rack in shallow roasting pan. Roast uncovered for 30 minutes. Brush hens, generously with the Plum Barbecue Sauce. Roast uncovered, brushing hens with the sauce 2 or 3 times, until done, about 45 minutes longer.