Soak the ribs in cold water to remove the blood.
Blanch the ribs in boiling water to remove impurities.
Put the ribs and water in a pot and bring to a boil.
Add radish, green onion, garlic, and ginger, and simmer over medium-low heat.
Strain the broth to make it clear.
Take out the ribs, radish, and green onion, and cut into bite-sized pieces.
Return the ingredients to the broth and season with salt and black pepper.