1. Rinse pig small intestine (1000g) with running water several times to remove dirt and mucus on the surface of the intestine.

2. Use scissors to cut the small intestine into pieces every 60cm. ?

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. Use both hands to pinch the edge of the opening of the small intestine, turn the opening outward, and then pour water into the turned-over interlayer.

5. Use the weight of running water to push the remaining part of the small intestine toward the middle. In this way, by turning the small intestine while flushing, the small intestine can be turned out and the inner wall faces outward.

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

7. Sprinkle 100g of flour on the pig small intestine, rub the small intestine thoroughly, remove the mucus and odor in the small intestine and rinse it with running water. Then put the small intestine on the faucet, open the faucet, fill it with water and clean it, and repeat steps 4 and 5 to turn the small intestine back to its original shape.

8. Pinch the opening of the small intestine with both hands again, and rub it carefully to separate the epidermal film and 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 so that the inner wall faces outward. Lay it flat on the chopping board. Use the edge of a square-edge chopstick to remove the thick film on the inner wall of the casing. At this time, you will find that a milky white transparent film is left. This is Casings for stuffing sausages.