Prepare a charcoal or gas grill for high heat (450° to 550°; you can hold your hand 5 in. above cooking grate only 2 to 4 seconds). In a large resealable plastic bag, combine garlic, mint, lemon zest, 1/4 cup olive oil, and 1 tsp. each salt and pepper. Add lamb chops and mix to coat.
Grill tomato, onion, and bell peppers, turning twice, until soft and blackened, 6 minutes. Remove from heat. Remove chops from bag, keeping marinade on meat. Grill chops, turning once, until done the way you like, 5 minutes total for medium-rare (cut to test).
Chop vegetables and mix with remaining 1/4 cup olive oil, the parsley, lemon juice, and remaining 1 tsp. each salt and pepper. Serve with lamb.
Note: Nutritional analysis is per serving.