1. Dry and expose the fresh fungus to the sun. The exposure process can decompose the toxins in the fungus. Just soak the dried fungus before eating. 2. Blanch, clean the fresh fungus, and then blanch it. You need to blanch it several times to filter out toxic substances. 3. Fresh fungus contains a light-sensitive substance called porphyrin. After it enters the human body, it will be distributed into human epidermal cells along with blood circulation. If you are exposed to the sun at this time, it may cause solar dermatitis, rash and other diseases. If you eat too much, it may also cause allergies in the respiratory mucosa and cause breathing.