Soak the seaweed in cold water and chop it into small pieces.
Clean the mushrooms thoroughly and cut them into bite-sized pieces.
Heat sesame oil in a pot and stir-fry the seaweed for 2 minutes.
Add the mushrooms and continue stir-frying.
Pour in 500ml of water and bring to a boil.
Simmer over medium heat for 10 minutes.
Season with soy sauce for soup and salt to taste.