Cut napa cabbage, green onion, mushrooms, and beef into bite-sized pieces.
Pour 500ml of water into a pot and bring to a boil.
Make broth using broth concentrate or kelp.
When the water boils, add the prepared vegetables and beef.
Once the vegetables and beef are cooked, add cup noodles and boil for 2 more minutes.
Season with pepper and salt to taste.
Serve in a bowl to finish.