This is the recipe of Korean-style (brown) seaweed soup. It's a traditional birthday dish in Korea and every new mother eats this soup because they believe that seaweed soup helps their breast feeding.
Soak the seaweed in room temperature water until soft, about 15 minutes; drain. Rinse the sheets and cut into 2 inch long pieces; set aside.
Heat the sesame oil in a saucepan over medium-high heat. Stir in the beef, salt, and 1/3 of the soy sauce. Cook and stir until the beef is crumbly and no longer pink, about 4 minutes. Add the seaweed and the remaining soy sauce; cook and stir 1 minute. Stir in the garlic and pour in the water. Bring to a boil; reduce heat to medium-low and simmer until the beef and seaweed are tender, about 15 minutes more.