1. The aniseed ingredients used to cook pig intestines are star anise, grass fruit and Sichuan peppercorns. Before cooking the pig's large intestine, clean the pig's large intestine with clean water. You can turn the large intestine over to remove all the oil and dirt inside, and then use a pressure cooker to cook the pig's large intestine.

2. If it cannot be washed with clean water, you can add some vinegar to the water, rub it several times, and then rinse it with clean water several times.

3. It is also possible to clean the pig intestines with rice water. It can clean the pig intestines very cleanly and remove the peculiar smell on the pig intestines. If you still feel an unpleasant odor after washing it with rice water, you can add some cornstarch, cooking wine, and salt and rub it a few times until there is no odor.