In a large bowl mix together ground pork, apple, onion, teriyaki and egg. If too dry add some juice from pineapple. If desired cube up pineapple and add to mixture. Form into patties.
Grill or cook in skillet on stove until done. Serve with or without buns. Serve on top of pineapple slices if desired.
Add jalapeno for spicier burger.