Place the roast in the oven and bake for about 15 minutes, then reduce the heat to 375 F (190 C). Roast for about 13-15 minutes per pound for rare, 17-19 minutes for medium, and 22-25 for cooked through.Check the meat with a thermometer to make sure it is the temperature you want it--145Â°F for medium rare, 160Â°F for medium. (Baste the roast a couple times while cooking, and keep an eye on the vegetables.oast for about 13-15 minutes per pound for rare, 17-19 minutes for medium, and 22-25 for cooked through. Check the meat with a thermometer to make sure it is the temperature you want it--145Â°F for medium rare, 160Â°F for medium.