1. The spine is cleaned and soaked for a while.
2. Put cold water in a pot, put it in the spine, bring to a boil, remove any scum, and blanch it for later use.
3. In another pot of water, add the spine after blanching, add corn and ginger and stew together.
4. After boiling, knock out the scum again.
5. Change to low heat and simmer for one hour.
6. After the spine is simmered, add the yam and continue to simmer for ten minutes. Turn off the heat and add salt.
7. Finished picture.
Tips:The corn is put in a stew at the beginning, the soup is sweet and has the taste of corn. It is best to use iron yam. The taste is good, and it will be very soft after ten minutes of simmering.
