It was mentioned in the book Liberation in the Palm of your Hand, Acharya Buddhajnana met a hungry ghost who had been wandering for twelve years in the human realm in search of food but had only found some dried spit after having fought with many other hungry ghost for it. The monk had dedicated the spit to the hungry ghosts as he was spitting.
Hungry ghosts can see human food from a distant, but when they approach it, the food disappears and they have to experience the anguish of disappointment. The only way that the hungry ghost can actually obtain human food is by its being especially dedicated for them.
Hence you can simply offer up your unfinished food to the hungry ghosts by dedicating to them.
We must realise hungry ghosts suffer from intense heat, intense cold, intense hunger, intense thirst, great fatigue and great fear. The real cause of rebirth in the hungry ghost realm is being miserly. Why do you have unfinished food? Do you take more than what you need? Clearly constant wastage from unfinished food which is eventually thrown way creates the causes not to have food in the future and a rebirth in hungry ghost realm!
Thanks for sharing this article Tenzin Malgyur.
Does anyone know, if we can't finished our food, can be dedicate or offer the unfinished food to hungry ghost? If so, how does we do it. The concerned is, if we always can't finished the food and offered, will the ghost following us because they knew they have food always?