Onion meat is prepared from pork belly. One receives finished onion meat mostly at the meat counter of well-assorted supermarkets. There are big differences in quality. The best thing to do is to make sure that the onion meat is as lean as possible. The onion meat is cut into thin slices and marinated in vinegar with spices and onion slices. It tastes very good on bread or as a side dish with fried potatoes.