First, put kosher salt on the surface of each pork bone and keep them in the fridge for one night.

Next day, wash off all the salt from each pork bone.

Place the pork bone in a big pot of water at room temperature. After bringing it to a boil, keep on high heat for about five minutes. Then, strain and wash each pork bone. Let them dry out.

Wash every slice of green mustard and separate between stem and leaves. Cut them into slices.

Wash the ginger and flatten.

Put the ginger in 3L of water and boil on high heat. After boiling, add pork bones. Boil them for about 15 minutes and turn to low heat for about 45 minutes.

Put the stem of mustard first for about one minute. Then put the mustard leaves in for about one minute. Serve.