Now let's talk about the second link. The canteen should set the food processing quantity according to the sales volume. It is best to have an order in advance, and the processed food should be colored, fragrant, delicious, shaped and complete. Diners should also take what they need and buy as much as they eat. I think this is better.
About how to reduce the food waste in the canteen, the answer is added; One of the waste factors in food processing is (1) food procurement. Buy things with high quality and low price. (2) food storage. Preserved articles shall not expire, rot or deteriorate. (3) Food processing. We should make the best use of it. (4) Food sales, sales should be first in first out.