If using bamboo skewers, presoak in water 1 hour. Place pork cubes in a resealable plastic bag, non-metal bowl or sealable container. In a separate bowl, combine apple juice, Dijon mustard, and honey and pour over pork. Seal or cover 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 onto skewers, alternating with pieces of pear, red onion, green or red peppers and zucchini.
Preheat barbecue on high; reduce heat to medium. Place kabobs on lightly oiled grill and brush with marinade; close barbecue cover and grill over medium heat for 10 to 12 minutes, turning occasionally and basting with apple juice marinade. Serve with rice.