Pour fresh mushrooms of different grades into 0.03% sodium metabisulfite solution, gently turn up and down, and wash away sediment, impurities, waxy substances and lipids on the surface of mushrooms. Rinse for 2 minutes and then put it into running water for washing. First boil the prepared 0.1% citric acid solution in the pre boiling machine, and then put the rinsed mushrooms. The ratio of water to mushrooms is about 3:2. Continue to boil until it is thoroughly boiled, 8-10 minutes in total, and then quickly cool down.

There are many kinds of mushrooms with rich nutrition, but after being processed into cans, they lack chewing power. When eating, they prefer the main food ingredients rather than separate dishes. Compared with mushrooms and carrots, they contain a variety of nutrients that they do not have. Moreover, carrots taste smooth and warm after heating, which can bring satisfaction to users when chewing staple foods. However, carrots are difficult to taste and have a single taste.