1, pig small intestine (1000g) was washed several times with flowing water to wash away dirt and mucus on the surface of the intestine.

2. Cut the small intestine into pieces every 60cm with scissors.

3. Hold one end of the pig's small intestine with both hands, keep it open, and pour flowing water into the small intestine to clean and remove the dirt inside the small intestine.

4. Hold the edge of the opening of the small intestine with both hands, turn the opening outward, and then pour water into the turned interlayer.

5, with the weight of running water, push the rest of the small intestine to the middle, so that the small intestine can be turned over while flushing, and the inner wall can be turned out.

6. Add 3 tablespoons of salt to the turned small intestine and knead it until there is no dirt on the inner wall of the small intestine, and then rinse it with flowing water.

7. Sprinkle 100g flour on the pig's small intestine, fully knead the small intestine, remove the mucus and odor of the small intestine and rinse it with flowing water. Then put the small intestine on the faucet, turn on the faucet for irrigation and cleaning, and repeat steps 4 and 5 to turn the small intestine back to its original state.

8. Hold the opening of the small intestine with both hands again and carefully knead it to separate the epidermal membrane from the inner layer.

9. Carefully tear off the separated epidermal film, and remove the white oil film and tendons on the small intestine. Be careful not to tear the small intestine during operation.

10. Finally, turn the small intestine over again to make the inner wall outward, lay it flat on the chopping board, and remove the thick film on the inner wall of the casing with the edge of square chopsticks. At this time, you will find that the milky transparent film is left, which is the casing needed for sausage filling.