One is: don't use salt water, it's easy to break when you fill it, first rinse the inside of the small intestine with water, then turn it over and take a piece of vegetable leaf to help to wash it, and then take starch and flour to wash it again and again. There is another way: using flour and vinegar is the easiest way. Mix the flour and vinegar together, make it dry, then rub it with the large intestine, and then rinse it with water. The lye only makes the sausage cook faster, but it's better to cook it slowly over low heat. Wash them well and soak them in salt for an hour. Then you can cook it without the bitter flavor.