How to arrange tributes when grandparents have passed away?

Types of sacrifices: food (preferably vegetarian), flowers, fruits, incense candles, etc.

The original sacrifices used food as the main method. "Book of Rites·Liyun" states: "At the beginning of the husband's rites, all kinds of food and drink are introduced. He burns millet, eats pigs, and eats them to defile his respects. He also eats braised strawberries and earthen drums, which can still be used to pay respect to ghosts and gods." This means that sacrificial rituals originated from offering food to the gods. As long as they burn millet and use pork as food for the gods, dig a hole in the ground to use as a kettle and hold water in their hands to offer to the gods, and beat earthen drums for music, people's lives can be transformed. Prayers and respects are conveyed to ghosts and gods. Studying the origin of words will also reveal that the words for "sacrifice" are mostly related to food. ?