1. Cut shiitake mushroom in half. Boil water and blanch chicken.
2. Boil 1.3L of water, then put in soaked mushroom water and ginger. Put in ginkgo, shiitake mushroom and chicken. Cover the lid and cook in mid-low heat for 50 minutes.
3. Open the lid, season the soup with pepper and salt. Put in bean curd sheet. Cover the lid and cook for mid-low heat for 15 minutes. Take out excess oil.