Everyone needs a roast beef and sauce recipe in their repertoire – if you’re looking for classic, this is it! Our time-test results are based on a roast that was about 4½-in (11.25 cm) long x 5-in (12.5 cm) wide x 4¼-in (10.5 cm) deep. NOTE: ‘Time-to-cook’ figures are rough guidelines only as cook time is dependent on so many factors such as: oven and thermometer accuracy, starting temperature of roast, roast shape and cut. A good thermometer is one of your best kitchen investments.