Cut the vegetables and mushrooms into bite-sized pieces.
Pour 400ml of water into a pan and bring it to a boil.
Once the broth is boiling, add the onions, green onions, napa cabbage, bok choy, mushrooms, and other vegetables.
When the vegetables are cooked, add one slice of beef brisket at a time and cook lightly.
Dip in sauce as desired before eating.