There is no need to remove the black skin from the belly. Rinse the tripe with clear water once or twice, then put it into the pot and turn it frequently by hand. Don't wait for the water to boil, just take out the tripe in advance, and then remove the dirty things on both sides of the tripe.

Cleaning method and cleaning method of pig, sheep and beef stomach, open the cow for the first time, clean it (note, don't go out with impurities such as oil, pour another tablespoon of cooking oil conveniently, rub the overall heat transfer performance with your hands, massage evenly after synthesis, and then rinse it with clear water several times. Then you will find that it not only has no smell, but also has white hair, which is very smooth.

Extended data:

Tripe contains protein, fat, calcium, phosphorus, iron, thiamine, riboflavin, nicotinic acid and so on. It has the effects of invigorating spleen and stomach, invigorating qi and nourishing blood, tonifying deficiency and replenishing essence, and quenching thirst and dizziness, and is suitable for people with deficiency of qi and blood, malnutrition and weakness of spleen and stomach after illness.

The extract of calf gastrointestinal mucosa can significantly inhibit the gastric ulcer induced by aspirin in rats, significantly reduce the content of malondialdehyde in glandular stomach and increase the content of glutathione peroxidase. The experimental results show that gastrointestinal mucosa extract can prevent and promote the healing of acute gastric mucosal lesions.

References:

Baidu encyclopedia-tripe