Picking and cleaning leeks are a bit cumbersome, and the structure of leeks is a bit easy to contain some pesticide residues, dirt and the like. If you don't pay attention to cleaning, there may be some problems.
Students' meals face the health of a large group of people, especially a group of people. A little carelessness will lead to serious poisoning incidents, hot current affairs and public opinion, which will have an impact on the reputation, funds and all aspects of the school.