Wash kumquat with clear water first, and then make two cuts on the top of kumquat with a fruit knife. After that, put the kumquat aside. Then pour a proper amount of water into the pot and add rock sugar; Boil over medium heat until the rock sugar is completely dissolved. Add all the washed kumquat and boil until the water boils. After the water is boiled, turn to low heat and shake the pot from time to time to make the taste more uniform. Boil on low heat for about 30-40 minutes, and you will find that the kumquat peel becomes transparent. At this time, add a little salt, stir gently and turn off the heat. Pour into a bowl, seal with plastic wrap and refrigerate overnight, then take out the drained sugar solution. Spread it in a large bowl, and put it in a microwave oven to heat it until it is tough.

Tip: Make two cuts on the washed kumquat, which is beneficial to quickly soak it in the cooking process; Finally, when cooking, adding some salt can make kumquat taste better; The sugar solution soaked in kumquat can be poured into a sterilization bottle for cold storage, and a proper amount of boiling water can be added when drinking; When microwave kumquat, take it out every 2 minutes to see the state, and continue microwave until it is tough.