Soak dried seaweed in cold water for 10 minutes.
Rinse the soaked seaweed thoroughly and drain the water.
Cut the beef into bite-sized pieces and stir-fry with sesame oil.
When the beef is half cooked, add the seaweed and stir-fry together.
Season with soy sauce and pour in water.
Once it starts boiling, skim off the foam and simmer on medium-low heat for about 15 minutes.
Adjust seasoning with salt if needed and serve.