Fresh auricularia auricula contains a porphyrin photosensitive substance, which will cause itching and edema of the skin after being irradiated by the sun, which will seriously lead to skin necrosis. Dried auricularia auricula is the finished product after exposure. During the exposure, most porphyrins will decompose. Soak the dried auricularia auricula in water before eating, and the residual porphyrin contained in it will dissolve in water, so the dried auricularia auricula can be safely eaten. Stir-fry auricularia auricula directly in oil pan, which is nutritious, healthy and environmentally friendly.