Like with side dishes, many vegetables go well with Lamb Loin. Roast several bulbs of garlic, in the grill or oven. Prepare the lamb. Cut up your choice of fresh herbs. Here I used parsley and rosemary. Chop finely. Spread garlic all over roast. Add herbs, adding some under the fat layer, too. Roll up loin and truss the roast with kitchen twine.
Whisk the olive oil, crushed garlic, rosemary, thyme, and lemon zest in a small bowl. Rub. Spread the marinad ingredients over the lamb. Roast. Place the boneless leg of lamb in the oven and roast until the meat reaches your desired doneness with a meat thermometer. (See recommended times below.) Rest.
Coat the entire lamb with olive oil, and then generously cover it with salt and pepper. Place the lamb on the center oven rack. Roast for about 1 hour, or until it has an internal temperature of 160°F (70°C), cooked to medium and slightly pink in the center. Set the lamb aside, and cover it loosely with tin foil.
Spread the stuffing out along the middle of the lamb, then fold the meat over to form a roll. Tie the string so the roll stays together, but don’t make it too tight or it will cut into the meat. Tie some string lengthways too, if necessary. Heat oven to 170C/150C fan/gas 3. Season the lamb evenly all over.