Soak the rice cakes in cold water for 10 minutes.
Slice the beef thinly and marinate with minced garlic, soy sauce, and sesame oil.
Put dried kelp and anchovies for broth in a pot, boil for 10 minutes to make the stock.
Remove the kelp and anchovies from the broth, then add the marinated beef and bring to a boil.
Add the soaked rice cakes and season to taste once they start to float.
Beat the eggs, make a thin round egg sheet, then slice it into strips.
Serve the rice cake soup in a bowl and garnish with egg strips, crushed seaweed, and chopped green onions.