Serve dinner picnic-style, featuring a platter of delicious sliced barbecue roast beef that you make ahead and yummy Fresh Chow Chow Relish. NOTE: ‘Time-to-cook’ figures are rough guidelines only as cook time is dependent on so many factors such as barbecue and thermometer accuracy, starting temperature of roast, roast shape and cut. A good thermometer is one of your best kitchen investments.