1. Soak the pig lungs in clean water for 30 minutes to remove blood and impurities.

2. Take out the pig lungs and scrape off the dirt and blood clots on the surface of the pig lungs with a knife.

3. Put the pig lungs into the pot, add enough water and bring to a boil.

4. After boiling, take out the pig lungs and rinse them with cold water to remove residual blood and impurities.

5. Cut the pig lungs with a knife and remove the blood clots and impurities in the pig lungs.

6. Cut the cleaned pig lungs into pieces of appropriate size.