Place pork cubes in a large zip-locked plastic bag. In a separate bowl, combine apple juice, Dijon mustard, and honey and pour over pork. Seal and refrigerate for 4 to 24 hours.
Remove pork from marinade, reserving marinade in a small saucepan. Bring marinade to a boil and boil for at least 1 minute.
Thread pork on skewers, alternating with pieces of pear, red onion, green or red peppers, and zucchini.
Place kebabs on grill and brush with marinade; close barbeque cover and grill for 10 to 12 minutes on medium temperature, turning occasionally and basting with marinade.