2. Soak in cold water for 1-2 hours to reach the best soaking state of auricularia auricula, without prolonging the soaking time for taste. If the soaking time is too long, the microorganisms inside will multiply in large numbers, and the microorganisms will easily produce some toxic and harmful substances. These substances may not be completely eliminated by cooking, which may bring risks.

Because the fungus itself is dry, microorganisms can't reproduce without water. However, in the process of soaking, microorganisms have enough water, and auricularia itself is a nutritious food, which is easy for microorganisms to reproduce. If it is summer, the temperature is relatively high, and the reproduction speed of microorganisms is relatively fast, which leads to an explosive increase in the number of microorganisms in the process of soaking fungus.