Place pork slices into a bowl and mix in marinade ingredients until well combined. Cover and leave to marinate in the refrigerator for 30 mins.
Heat up 2 tbsp oil in a pan and fry marinated pork until cooked. Dish out and set aside.
Add ½ tbsp oil into the pan and fry onions and capsicums until softened. Toss cooked pork back into the pan and add in seasoning mix ingredients. Stir well.