You can't. According to the inquiry, Dr. Youlai. Com shows that dried shiitake mushroom is a kind of dried product, which will produce shiitake mushroom essence during the drying process, making shiitake mushroom more fragrant. However, it is unsanitary for dried mushrooms to be stewed directly, and it is difficult to cook, and the taste is not good, and the nutrients cannot be completely separated. So before stewing the soup, be sure to clean the dried mushrooms and soak them in warm water for one or two hours. After stewing the soup, the nutrients of shiitake mushrooms are completely released and the taste is suitable.