After the black chicken goes to the internal organs, it is washed and spared. Yam is peeled and cut into pieces, soaked in clear water to avoid discoloration. Wash and spare. Sliced onion, ginger slice
Pour the pot of water into the casserole (my pot is purple sand pot), put it into the black-bone chicken, boil it, and remove the floating foam.
Put in simmer, jujube, pepper, onion, ginger, and turn to simmer for 2 hours.
After adding yam, season with salt