Slice the beef thinly.
Soak the rice cakes in cold water.
Prepare the dumplings.
Stir-fry the beef in a pot.
Pour in 500ml of water and bring to a boil.
Add the rice cakes and cook.
Add the dumplings and cook further.
Season to taste.
Beat the egg and add it to the soup.
Add green onions and bring to a boil once more.