Peel the kidney candy in hot pot. According to the relevant public information inquired, the waist slice of hot pot is actually a slice cut from the kidney of a pig. Practice: Tear off the outer membrane of pork loin slices, cut them into two pieces with a knife, remove scum and tendons, cut them into oblique pieces, put them in a basin, soak them in clear water for half an hour, remove blood, rinse them with clear water and put them in a plate for later use.