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Ingredients:
Sweet potato 2
Water 3 cups
Rock sugar appropriate amount
Ginger 2 slices

Steps:
  1. Peel sweet potato. Rinse and cut into small pieces. Soak in water to avoid turning black.
  2. Add ginger and sweet potato to boiling water. Turn to low heat when the water boils again. Simmer until the sweet potato turns soft.
  3. Add rock sugar to your taste.