Cut napa cabbage, mushrooms, tofu, and green onion into bite-sized pieces.
Remove excess blood from the beef with a paper towel and cut it into bite-sized pieces.
Pour broth into a pot and bring it to a boil.
Once the broth boils, add napa cabbage, mushrooms, tofu, green onion, and beef in order.
Season with soy sauce, minced garlic, salt, and pepper.
Simmer over medium heat until all ingredients are cooked through.