Prepare the marinade by combining the apple juice, soy sauce, sugar, garlic, and ginger.
Use a sharp knife to trim and filet the chicken open so that it will lay flat with even thickness across.
Place the trimmed chicken in a zip top bag and add the marinade. Push out as much air as you can, and place the bag in the fridge for at least 4 hours or as much as overnight.
When ready to cook, preheat your grill on high, reaching around 450°. Once it has reached that target temperature, turn your burners down to medium high heat.
Place the chicken "presentation side" down on the grill. Set a timer for 90 seconds.
Continue cooking and flipping chicken every 90 seconds until it reads 160° internal using an instant read thermometer.
Remove chicken from the grill, cover with foil, and allow them to "rest" for 5-10 minutes. This will allow time for the juices to settle as well as the carryover cook to raise the internal temperature an additional 5°.