Soak ox bones in cold water for about 2 hours to remove the blood.
Boil the ox bones in boiling water for about 5 minutes to eliminate any odor, then rinse thoroughly.
Place the clean ox bones and water in a pot and simmer over medium-low heat for 4 to 5 hours to make broth.
Soak rice cakes for rice cake soup in cold water for about 10 minutes to soften.
Once the broth is ready, remove the bones and strain the broth to remove any solids.
Add the soaked rice cakes to the ox bone broth and bring to a boil.
When the rice cakes become soft, season with salt and soup soy sauce.
Serve the rice cake soup in bowls and top with garnishes such as egg strips, seaweed flakes, and green onions to finish.