how long to cook a rack of lamb in the oven
Directions. 1  Prepare the racks of lamb at least 1 hour (or up to 4 hours) before cooking: Chop together the garlic, salt, rosemary, and pepper to make a coarse rub. 2  Preheat oven to 425Â° F. Heat a roasting pan in the oven for 10 minutes.