Marinate pork with seasoning ingredients for several hours or preferably overnight in the refrigerator.
Heat enough oil in the wok and deep-fry marinated pork pieces until golden brown. Drain and set aside.
Heat a little oil in a wok and add combined Marmite sauce ingredients. Bring to a simmering boil, then add the pre-fried pork. Reduce heat and simmer, covered, for 30 minutes or until pork is tender. Thicken sauce with cornflour mixture.