Set a wok over a high heat, and add 4 tablespoons groundnut oil. Fry the eggplant slices with just a splash of water, being careful of the splatter, until softened and golden on the outside. Transfer to a plate, and set aside.
Wipe down the wok, reheat, and add the remaining 2 tablespoons groundnut oil. Stir-fry the garlic, ginger, and chile for a few seconds, and then add the ground pork. Stir-fry for 1 minute, and then pour in the rice wine or sherry. Cook until the meat has browned, and then add the chile bean sauce, and stock. Return the eggplant slices to the wok, along with the pak choy.
Season the dish with the vinegar, and sesame oil, and bring everything to a boil. Stir in the chopped spring onions. Add the blended cornstarch slurry, and stir to thicken the sauce. Serve immediately.
Can be found at specialty Asian markets.