1. Rinse the bones and blanch them with water
2. Rinse again
3. Peel the yam, wash and cut into large pieces
4. Pour enough water into the pot at a time, put the bones and ginger on high heat to boil, turn to low heat and cook for an hour and a half
5. Put the yam and cook for half an hour
6. Put the oil and salt and stir evenly
7. Just make a pot of healthy soup
Tips:~
