Soak dried seaweed in cold water for 10 minutes.
Cut the soaked seaweed into small pieces.
Slice beef into bite-sized pieces.
Add sesame oil to a pot and stir-fry the beef.
Add seaweed and stir-fry together.
Pour in 500ml of water and bring to a boil.
Season with soy sauce for soup.
Simmer over medium-low heat for about 10 minutes.