Place the chicken strips into a bowl and season with the salt and Chinese five-spice powder.
In a small bowl, mix together the chopped chilli, grated ginger and chopped garlic. Add about a fifth of this mixture to the chicken and mix well, then set the chicken aside to marinate for a few minutes.
Heat the groundnut oil in a wok until starting to smoke, then add the chicken and fry for 2-3 minutes, turning the chicken over once, until golden-brown all over. Transfer the seared chicken, along with any juices, from the wok into a bowl and set aside.
Return the wok to the heat and add the sesame oil. Fry the remaining chilli, ginger and garlic mixture for about 30 seconds, or until fragrant, then add the carrots, cabbage and broccoli and stir fry for 1-2 minutes.
Add the chicken back into the wok (reserving the juices).
In a small bowl, mix together the sake, Shaoxing rice wine, one teaspoon of the nam pla and the sweet chilli sauce, then add to the wok and stir well.
Add the chopped bok choi and spring onions to the wok along with the cooked egg noodles. Stir fry for 1-2 minutes to heat through, then add the beansprouts.
Add the light soy sauce, one tablespoon of sake, the remaining nam pla and the cornflour. Mix well to combine, then add to the wok and cook for one minute, or until the liquid has thickened slightly.
To serve, season the chow mein with freshly ground black pepper and divide among four serving plates. Garnish with the fresh coriander leaves.