1. Wash pig tails and use tweezers to remove the remaining pig hair, and then cut 5 cm into sections
2. Put enough water in the casserole at one time, then add vinegar, boil, and skim the foam
3. Add green onion, ginger, star anise, cover the pot and simmer for about one and a half hours
4. The soup is already milky white in one and a half hours. Add the sliced radishes and cover and simmer for 20 minutes.
5. After 20 minutes, add pepper and goji berries, turn the heat on slightly, and finally sprinkle with salt to enjoy
