1. First cut the pig liver into 0.3cm thin slices, and then soak it in clear water for 3 minutes. After 3 minutes, take out the pig liver and put it in the basin.

2. Put all the old vinegar, flour and a little water into the pig liver, and then continue to catch the pig liver 1 minute. 1 min later, let the pig liver stand for 5 minutes, and then clean it with running water for use.

3. Add starch and a little water to the pig liver, and then continue washing 1 min. After the time is up, wash the pig liver with running water for later use.