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.
Method. 1  Preheat the oven to 220ÂºC. 2  Brush the roast lightly with oil and season with salt and pepper. 3  Place the lamb on a rack in a roasting dish. 4  Roast for 15 minutes for rare, 25 minutes for medium, or 30 minutes for well done.5  For ease and accuracy use a meat thermometer. Place the lamb on a rack in a roasting dish. 2  Roast for 15 minutes for rare, 25 minutes for medium, or 30 minutes for well done. 3  For ease and accuracy use a meat thermometer.