Rack of Lamb Genghis Khan

To make the marinade, combine the first ten ingredients. Place in a plastic bag with the lamb and marinate in the refrigerator for 48 hours.Remove the lamb from the marinade, place in a shallow roasting pan and let stand at room temperature.Heat oven to 450 degrees.Roast for 15 to 25 minutes, depending on the size, or to 120 degrees for rare lamb. The hoisin sauce is brushed on during the last 5 minutes of roasting.Rest 6 to 7 minutes before carving.