Directions. 1  Preheat oven to 450 degrees. 2  Season lamb racks with salt and pepper; coat each evenly with 3 Tbsp pesto. 3  Roast on baking sheet until about 5 degrees less than desired doneness (about 20 min for medium). 4  Transfer lamb to clean platter; let rest 10 min before slicing.
Preheat the oven to 400 degrees F. Using your hands, rub the lamb all over with the lemon juice. Pat the garlic and rosemary evenly all over the surface of the meat. Season the meat with the salt and pepper and place the lamb in a roasting pan. Place the lamb in the oven and roast for 30 minutes.
1. Roast the lamb for 30 minutes. Place the roasting pan in the oven and roast at a high temperature for half an hour. This will create a delicious crust around the leg of lamb.llow the lamb to rest for 15 minutes. Tent aluminum foil over the baking dish and let the lamb rest. This gives the juices time to reabsorb into the meat, creating a succulent, tender dish. After 15 minutes, you may carve the lamb.