04Heat oven to 450 degrees. Place roast upside down (bones down) in large roasting pan. (You can use a rack to help steady it if you like.) Roast for 20 minutes, then turn heat down to 350 and continue roasting until meat registers 145 degrees on an instant-read thermometer, about 1 1/2 to 2 hours longer. Let rest 10 minutes before carving.