Often referred as "The Lamb Chateau Briand", these Lamb Loins are fully deboned and tied for easy cooking and carving. These Lamb Loins are a great substitute for the classic Beef Tenderloin Roast, for those looking for a "Gamey Roast". Medium rare: Cook until internal temperature is 145°F for 15 seconds. Medium: Cook until internal temperature is 160°F for 15 seconds. Well done: Cook until internal temperature is 170°F for 15 seconds.