Which side do you served preplated food on right or left?

There's no single "right" or "left" side to serve preplated food on. It depends on a few factors:

* The specific dish: Some dishes are designed to be eaten with the fork in the left hand and knife in the right (Continental style), while others are meant for the fork in the right hand and knife in the left (American style). This will influence the side you place the plate.

* The dining setting: In formal settings, the plate is usually placed in front of the guest, with the fork on the left and the knife on the right. In casual settings, it's less important.

* Personal preference: Some servers might prefer a particular side based on their own comfort level or the layout of the table.

Generally, the most common practice is to place the plate in front of the guest, with the fork on the left and the knife on the right. This allows the guest to easily pick up the fork and knife with their dominant hand and start eating.

If you're unsure, it's always best to ask your guest or follow the lead of other servers.