1. Clean the skin first, and the most important thing is to clean the hair on the skin, so that it will taste good. After that, add water to the pot. After the water is boiled, put the skin in the pot for a while and then take it out. Cut off the oil on the skin with a knife when it is not hot, and then wash it with water. Finally, cut the washed skin into small strips and put them in a clean pot, and add more than half of the water (if you want pure white crystal jelly, you don't need to put any seasoning, you can put some cooking wine to remove the fishy smell; If you want to see the color, then add some soy sauce to the pot, which will make the food look better. Then, after the fire is boiled, cook it with medium or small fire until the soup is thick, that is, after the water is almost half, turn off the fire, cool it, pour it into a container and put it in the refrigerator. After the jelly is fully formed, you can change the knife and serve. 2. It's best to sprinkle some shredded garlic or coriander on it before eating (I don't have garlic or coriander at home today, so I use celery leaves to color it for the time being) 3. Pour in the prepared soup (the soup is made with a little soy sauce, vinegar and sesame oil), which is delicious.