Place the pork slices into a bowl along with ½ tbsp rice wine, 1 tsp dark soy sauce, ½ tbsp chilli bean sauce and 1 tsp corn flour. Massage the marinade ingredients into the meat and set aside for 30 minutes.
While the pork is marinating, in another bowl combine 1 tbsp light soy sauce, 3 tbsp chilli bean sauce, 1 tsp sugar and ½ a cup of water and set to one side.
Place a wok over a medium to high heat and once hot, add the oil and marinated pork to stir fry for 1 minute. Add the garlic and chilli flakes, fry for 45 seconds and then pour in the sauce mixture, giving everything a good stir. Add the napa cabbage and continue to stir fry for another 1-2 minutes. Give the corn flour slurry a mix and slowly add to the sauce stirring constantly. Once your sauce has thickened, remove from the heat and transfer to a serving plate.