1. Simple material
2. Soak the white fungus in water until fully developed
3. Soaked white fungus, remove the pedicles, wash away impurities, and tear small flowers
4. Add water to the pot, put the white fungus and cook for half an hour
5. Peel the yam, wash and cut into pieces
6. Peel and cut apples
7. Put the yam and apple into the soup pot and cook for half an hour
8. Finally, add an appropriate amount of rock sugar and stir to melt it.
