Clean the beef brisket, radish, green onion, and garlic thoroughly.
Pour water into a pot, add the radish, green onion, and garlic, and bring to a boil.
Once the broth is ready, remove the radish, green onion, and garlic.
Add the beef brisket and boil.
Add mushrooms and simmer a bit more.
Season with soy sauce for soup, salt, and pepper.
Serve in a bowl and garnish with green onions.