Soak seaweed in cold water for 10 minutes, then drain.
Cut the beef into bite-sized pieces and season with soy sauce and minced garlic.
Heat sesame oil in a pot and stir-fry the beef.
Add the seaweed and stir-fry together for 2-3 minutes.
Pour in 700ml of water and bring to a boil.
Skim off any foam and simmer on low heat for 15 more minutes.
Season with soy sauce and salt to taste.