Sometimes the best thing about roast beef is the meal that you can make the day after! This salad uses ingredients more in-step with winter cooking, so it is a nice way to use leftover Sunday-night roast during the week in the colder weather. See ‘Tip’ below for how to cook a 3 lb (1.5 kg) Beef Strip Loin Oven Roast. 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.