Trim fat from chops. Place chops in a plastic bag set in a shallow dish. For marinade, combine lemon juice, oil, garlic, 3 tablespoons of the mint, and the pepper. Pour over the chops; close bag. Marinate in the refrigerator for at least 30 minutes or up to 24 hours. Drain chops, discarding marinade. Sprinkle chops with the salt.
Grill chops on rack of an uncovered grill directly over medium heat to desired doneness, turning once. (Allow 10 to 14 minutes for medium-rare and 14 to 16 minutes for medium doneness.) Sprinkle with remaining mint. Makes 4 servings.