I was curious why they burned the object, then I surfed the internet. Here I found the answer from the internet. But sorry, I am not sure if I can translate it correctly or clearly as my English is not good enough. About this ceremony,Tibetan call it净供Jing Gong, means pure oblation worship.Taiwanese call it 烟供Yan Gong, means smoke oblation worship.Local People here call it 火供Huo Gong, means fire oblation worship. It is said that because of the smoke produced through burning the oblation can clean yourself and clean and object, so it called净供Jing Gong, But the common customs see the smoke and fire so they directly called it烟供Yan Gong or 火供Huo Gong. Significance: It says that the Huo Gong (fire oblation worship) help those unfortunate creatures who incarnated into evil ways, including our dead ancestors. It is said that “borne in the evil ways of karma, because had done evil (bad thing) in the past life, so they have to live in misery and suffer hunger and cold. We can help the evil beings by practicing Huo Gong (smoke oblation worship) and giving food to others (Note: see the master works《本尊海会I》) or the spell etc.. Through the blessing power and spell power, who can make the smoke and applied water into “food and drink” to save the hungry ghosts, so as to relieve their pain.” That is to say only this way of supplying, they can get a little benefit. Significance: It says that the Huo Gong (fire oblation worship) help those unfortunate creatures who incarnated into evil ways, including our dead ancestors. It is said that “borne in the evil ways of karma, because had done evil (bad thing) in the past life, so they have to live in misery and suffer hunger and cold. We can help the evil beings by practicing Huo Gong (smoke oblation worship) and giving food to others (Note: see the master works《本尊海会I》) or the spell etc.. Through the blessing power and spell power, who can make the smoke and applied water into “food and drink” to save the hungry ghosts, so as to relieve their pain.” That is to say only this way of supplying, they can get a little benefit. Best wishes
