Soak the rice cakes in cold water for 10 minutes.
Thinly slice the beef and mix it with seasoning sauce (soy sauce, minced garlic, pepper).
Add beef and sesame oil to a pot and stir-fry.
Once the beef is cooked, pour in water and bring to a boil.
When the water boils, add the soaked rice cakes and simmer over medium heat.
When the rice cakes float to the surface, season with soup soy sauce and salt.
Beat the eggs, make an egg omelet, and slice it thinly.
Ladle the rice cake soup into a bowl and top with sliced egg omelet, seaweed flakes, and green onions.