Step 1: Soak the pork ribs in water for a while, rinse a few times to remove the blood, wash the yam.

Step 2: Peel the yam and cut into pieces.

Step 3: ribs fried once, rinse clean.

Step 4: Heat oil in a pot, add onion and ginger and burst incense.

Step 5: Add the ribs and stir-fry, add soy sauce and soy sauce and continue to stir-fry for a while.

Step 6: Pour in enough hot water, boil over high heat, add star anise and cinnamon, turn to medium heat and simmer for 30 minutes.

Step 7: Add the yam and continue to simmer for 20 minutes, until the yam is soft and the soup is thick.