Preparation materials: pig bones, yam, clear water, astragalus, medlar, salt and chicken essence.

Step 1: First, cut the yam into long strips, as shown in the following figure:

Step 2, blanch the pig bones to remove blood foam, as shown in the following figure:

Step 3: Next, add pork bone and yam slices, and add the prepared auxiliary materials, as shown below:

Step 4: Bring the fire to a boil and simmer for 3 hours, as shown below:

Step 5: Finally, add seasoning and take it out, as shown below: