01 - Set the oven to 400°F.
02 - Pat the lamb dry. Make small incisions all over and insert garlic slices into each slit.
03 - Rub the lamb with olive oil, then evenly sprinkle with sea salt, black pepper, rosemary, and thyme.
04 - Place the lamb in a roasting pan. Roast for 20 minutes at 400°F, then reduce the temperature to 350°F and continue roasting for about 1 hour or until the internal temperature reaches 140°F for medium-rare.
05 - Remove from oven, cover loosely with foil, and let rest for 15 minutes before carving.
06 - Dissolve sugar in boiling water. Stir in mint, vinegar, and salt. Let infuse for at least 10 minutes before serving.
07 - Carve the lamb and serve with the mint sauce alongside optional sides.