2. After the pork liver slices are soaked, add about 5g old vinegar to marinate the pork liver. This is the key step in cooking pig liver. If there is no aged vinegar, you can use white vinegar instead. Don't worry, a little jealousy won't affect the taste of pig liver.
3. In the process of cooking, after the water is boiled, quickly put the pork liver into the pot, wait until the pork liver becomes discolored, and cook for one minute, not for too long.