Cut the beef into large dices, rub [A] onto the beef pieces, and leave for 30 minutes.
Heat the sesame oil in a frying pan over medium heat and fry [1]. When the beef turns brown on all sides, sprinkle the curry powder and stir-fry. Add the sake and let it come to a boil.
Move [2] into a pot together with the soup. Add the specified amount of hot water and [B]. When it comes to a boil, braise for 40 to 50 minutes over low heat.
Take out the beef when it is cooked through and tender. Taste the remaining soup, and if it needs more taste, add salt.
Boil the bok choy.
Cook the noodles.
Put the noodles in a bowl, place the beef and bok choy on top, and pour the soup over the noodles.
