Boil water in a pot, add 1 piece of natural stock cube and 3 tablespoons of tuna sauce.
Cut, wash, and prepare napa cabbage, bok choy, enoki mushrooms, mung bean sprouts, and brisket in order, then add them to the pot and boil.
When the brisket is fully cooked and the bok choy and bean sprouts are soft, turn off the heat and enjoy.