1. Boil a pot under water until the skin is soft and let the pot cool
2. Prune, rock sugar and appropriate amount of water, boil until melted and let cool for later use
3. Peel off the skin and put it in a container
4. Add some lemon juice and pour in the plum rock sugar water
Tips:Put it in the refrigerator for two hours before eating it tastes the best sweet and sour appetizer
