Extra 1/2 cup Roasted Garlic Marinade & Stir Fry Sauce for serving
For the marinade, combine the rice vinegar, olive oil, lemon juice, Kikkoman Roasted Garlic Marinade & Stir Sauce, ginger, onion and chilli flakes and mix to combine
Place lamb in a large, flat non-metallic dish and pour over the marinade, turning to coat. Cover with plastic wrap and place in refrigerator for 2 hours to marinate, turning once
Pre-heat barbecue grill on moderately high heat. Remove lamb from refrigerator and pat dry with paper towels to help prevent burning. Reserve marinade
Cook lamb for 10-12 minutes each side, or until cooked to your liking, basting from time to time with the reserved marinade
Transfer meat to a carving board and allow it to rest for 15 minutes before slicing
Place half a cup of Roasted Garlic Marinade in a small jug and serve separately
