If the room temperature is above 20 ℃, especially in the summer high temperature, fungus deterioration rate is very fast. When the foaming time is more than 8 hours, the amount of bacteria caused by spoilage will reach several times to dozens of times the original, it is possible to generate toxins.

Foaming fungus is best done with hot boiling water, hot water will shorten the foaming time and reduce the chance of fungus being contaminated by bacteria. When I do my own cooking, it only takes 3~4 hours to foam the fungus with this method. It should be reminded that with the high temperatures in summer, food is very prone to rotting and spoilage, which can lead to bacterial food poisoning, especially cooked food, pasta and overnight dishes, all of which are susceptible to bacterial infection. Summer should pay special attention to dietary hygiene, the public if they feel that the food is abnormal, do not eat again, so as to avoid food poisoning, due to small losses.