Production steps:
1. Cut the yellow root induration of dried tremella with scissors.
2. Cut the tremella into pieces, and the more broken the glue, the better. Soak in cold water for 2 hours.
3. soak white fungus.
4. Wash the tremella and pour it into the casserole.
5. Add two bowls of water, generally twice as much as tremella.
6. Bring the fire to a boil, then simmer on low fire 1 hour. Keep the pot slightly boiling, and then stew it in a casserole overnight.
7. Turn on the fire the next day, add the chopped purple potato pieces and cook for 10 minutes.
8. Finally, add rock sugar and stir until it melts. Sprinkle with medlar and serve.
9. Serve immediately.