In A Large Resealable Plastic Bag, Combine The Lemon Juice, Oil, Parsley, Onion, Garlic, Lemon Peel, Thyme, Salt And Pepper; Add Chicken. Seal Bag And Turn To Coat; Refrigerate Overnight, Turning Occasionally. Drain And Discard Marinade. Grill Chicken, Covered, Over Medium Heat For 35-40 Minutes Or Until Juices Run Clear, Turning Every 15 Minutes.