Make marinade:
Blend all marinade ingredients together and salt and pepper to taste.
In a large sealable plastic bag combine lamb and marinade and seal bag, pressing out excess air. Marinate lamb, in a refrigerator, turning occasionally, 2 hours.
Prepare barbecue grill and preheat oven to 400ฐF.
Remove lamb from bag and discard marinade. Grill lamb on an oiled rack on a gas barbecue or set 5 to 6 inches over glowing coals. turning, until browned all over, about 4-6 minutes.
Transfer lamb and place meat sides up, to a shallow baking pan and roast in 400 degree oven for 10 minutes. In a dry heavy skillet toast sesame seeds over moderately high heat, stirring, until fragrant and golden. Sprinkle lamb with sesame seeds and roast 5 to 10 minutes more. Meat thermometer should register 130ฐF. for medium-rare.
Let lamb stand for10 minutes on a cutting board. Cut into chops and serve.