In life, we can often see all kinds of pickled foods. Almost all the foods we see seem to have pickled products, and such foods can be seen everywhere in life.

Common pickled foods include pickled mushrooms, bacon, sausages, pickled vegetables, salted fish, strawberries, coriander hearts, ginger and so on. Dehydrated fruits and vegetables include dried mushrooms and shredded onions.

Salted food, pickles, salted fish, ham, sausage and other foods are mixed with nitrate and nitrite, and nitrate can be reduced to nitrite. Nitrate or nitrite is often used in the pickling process of Ningbo cuisine. If used improperly, nitrosamines will be formed. At the same time, there is a certain amount of nitrate and nitrite in human saliva.