I would advise against burying your victims. It might work in the short term, but in the long run the authorities may become suspicious at the sudden abundance of fruit bearing trees on your property. I find smoothies are usually the most efficient, but if you cant bring yourself to consume them yourself it's quite easy to bake the parts into something like a pie or a cobbler and give them to someone as a gift. It a win-win, they get free food and you get rid of the evidence.