Slice the cooked pork thinly, about a quarter of an inch thick or thinner. To make slicing easy, wrap the cooled pork in cling film and chill until firm. Overnight is best.
Stir together equal amounts of light soy sauce and honey. How much depends on the weight of the pork. As a guide, 4 tbsps. of soy sauce and 4 tbsps. of honey for every 200 g. of pork should be a good starting point.
Arrange the sliced pork in a shallow pan. Stand the slices up so that they look like sliced loaf bread. Then, spread them a little so that each slice is resting on the one next to it — just like they look in the photos.
Pour in the soy-honey mixture. Cook over medium-low heat, covered, until the sauce is thickened, about 15 to 20 minutes. Spoon the sauce over the pork slices every few minutes.
Using a spatula, scoop out the pork slices and transfer to a platter. If using sesame seed oil, drizzle it into the sauce in the pan and stir. Pour the sauce over the pork, sprinkle with scallions and serve.