There is a layer of sticky transparent mucus on the surface of pig's large intestine, which can't be washed off with water. Put it directly into the basin, add a spoonful of flour and a spoonful of starch, then pour in a proper amount of water, wash it by hand, and wipe the flour and starch on the surface of the pig's large intestine. Flour and starch have good adsorbability. When they are mixed with mucus, they become lumps and absorb all the dirty things. The pig's large intestine is washed twice with clean water, and the mucus on the surface will be washed off.
Then turn the pig's large intestine upside down and you will find a lot of white fat on the surface. Tear off all this fat by hand, or it will taste greasy. Of course, if you like the smell, you can keep it. Add some flour, starch and vinegar and continue to scrub by hand. After 5 minutes, the grease and dirt on the surface are gone, and it becomes a hard block, and then it is rinsed with clean water. After repeated cleaning twice in this way, the pig's large intestine is cleaned.
Skill summary
There is mucus and fishy smell in the pig's large intestine, so it is useless to use salt, which can neither wash away the mucus nor remove the fishy smell. The correct way is to wash with flour, starch and vinegar. The first two substances have good adsorbability, can adsorb all dirty things, including mucus and feces, and are very easy to clean. Moreover, vinegar has the function of removing fishy smell and enhancing fragrance, which can remove the odor of pig's large intestine. It is best to use balsamic vinegar or rice vinegar.
Although flour and vinegar can clean the large intestine of pigs, it is not enough to rely on flour and vinegar alone, and a proper amount of lemon juice must be added. The pig large intestine washed out in this way is not only clean, but also has no odor at all.
When cleaning the pig's large intestine, don't forget to blanch it so that it can be thoroughly cleaned. In addition, it should be noted that hot water should be used instead of cold water when blanching. If there is no hot water at home, you can pour cold water into the pot first, then boil it with fire and then pour it into the pig's large intestine.