1. Prepare the materials.
2. The barley is soaked 1 hour in advance.
3. Soak the white fungus in advance.
4. Put the soaked barley and white fungus into a boiling pot, add some water to boil, and cook on low heat for 1 hour.
5. Wash the sweet potatoes and cut into small pieces.
6. Barley and white fungus are boiled and softened. Add sweet potatoes and cook for about half an hour until the sweet potatoes are cooked.
7. Add an appropriate amount of rock sugar to taste.
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