Mix the sake, mirin, soy, garlic and chilli. Cut the chicken into strips, put in a bowl and cover with this marinade. Leave for an hour.
Cook the noodles in boiling salted water and throw in the choi sum for the last 2 minutes’ cooking. Drain. Heat up the stock.
Into a hot wok or frying pan pour the oils and, when they in turn are hot, throw in the pieces of chicken and toss abo