Choose a round, pale green cabbage with a firm heart -- never use loose-leafed cabbage. Wash in cold water, and cut the leaves into small pieces about the size of a matchbox.
Cut the chilis into small bits. Mix the soy sauce, vinegar, sugar, and salt, to make the sauce.
Heat the oil in a preheated wok or large skillet until it starts to smoke. Add the peppercorns and the red chilis, and a few seconds later, the cabbage. Stir for about 1½ minutes until it starts to go limp.
Pour in the prepared sauce and continue stirring for a short while to allow the sauce to blend in.
Add the sesame oil just before serving.