1. Cut the apples into small cubes and soak them in salt water to prevent discoloration.
2. Wash the rice cake and cut it into small pieces.
3. Boil water in a pot, add rice cakes, and cook until the rice cakes float.
4. Add apples, a few pieces of rock sugar and wolfberry, and boil for a minute or two.
5. Add the glutinous rice and bring to a boil.
