2. Wash the jar thoroughly with running warm water. Dry the water (especially the bottom of the pot), put the pot on the stove and dry it on low heat.

3. Put the raw and fat pork into the pot, hold it down with chopsticks or clips, and evenly spread it on every corner of the pot, so that the spilled oil can evenly spread over the whole pot.

4. Keep wiping, the more lard spilled in the pot, the smaller and darker the pigskin.

5. Remove the whole pot from the stove fire, pour out the lard, clean it with kitchen paper or toilet paper, dry the pot with warm water, put the pot on the stove fire, and repeat steps 2, 3 and 4.

6. After the surface of raw pork is baked hard, you can remove the surface with a knife and then continue to wipe it in the pot. Do this until the fat pork no longer turns black.

7. Rinse the cast iron pan with warm water and dry the water.

8. Put it on the stove fire, dry it on a small fire, coat it with a thin layer of vegetable oil with kitchen paper or toilet paper, and maintain it after boiling.