1. Combine orange juice and next 5 ingredients in a shallow dish or large zip-top freezer bag; add chicken. Cover or seal, and chill at least 1 hour, turning occasionally.
2. Remove chicken thighs from marinade, and discard marinade.
3. Grill, covered with grill lid, over medium-high heat (350° to 400°) 4 minutes on each side or until done. Garnish, if desired.