Combine first 7 ingredients in a shallow dish or large heavy-duty zip-top plastic bag; add lamb chops. Cover or seal, and chill 8 hours or overnight, turning chops occasionally. Let stand at room temperature 30 minutes.
Remove chops from marinade, discarding marinade. Grill, covered with grill lid, over medium-high heat (350° to 400°), turning occasionally, 12 minutes or until a meat thermometer inserted into thickest portion registers 145°. Garnish, if desired.