1. In a non-stick frying pan, place the sliced pork (one by one) and cook until well browned and crispy over high heat. Transfer to a paper towel lined plate to remove excess oil. Remove the oil from the pan, and repeat the same until all the pork is done. Set aside.
2. In a small bowl, add all the seasoning ingredients and mix. Set aside.
3. In a wok (or frying pan), heat 1 tbsp vegetable oil and fry the garlic and ginger until fragrant. Add the cooked pork, then pour the sauce. Mix.
4. Add the leek and saute lightly. Serve hot!
If you want to keep more crispy for the pork :
After you fry the garlic and ginger, first you add the leek and the sauce, saute lightly to coat the leek with sauce evenly, finally add the pork. Mix quickly until the pork is coated with the sauce.