Prepare the pork by cutting it into thin 2- to 3-inch (5-7 cm) long slices and then julienning the slices into strips. Transfer to a bowl, and add the water, cornstarch, light soy sauce, vegetable oil, sesame oil, and white pepper. Mix well and set aside.
Meanwhile, prepare the napa cabbage, ginger, garlic and scallions. If your rice cakes are stashed in the freezer, take them out. If they’re vacuum sealed, open them up and break them apart if they’re stuck together. (We prefer the Chinese brands that are individually frozen and bagged loosely.)
Heat a wok over high heat until it’s just starting to smoke. Add the oil, followed by the ginger. Let cook for 30-60 seconds, until golden on the edges. Then add the pork in one layer, and let it sear evenly. Avoid stirring it too much so it can get some color.
Add the garlic, stir fry for 30 seconds. Then add the napa cabbage and scallions. Stir-fry for a few minutes, letting the cabbage wilt down.
Add wine around the perimeter of the wok. Mix and stir-fry for another 30 seconds.
Stir in the oyster sauce, and move everything to the center of the wok to create an even “bed” of vegetables and meat. Add the chicken stock and spread the rice cakes on top of the mound of cabbage.
Cover and cook for 2 minutes over high heat (3 minutes if the rice cakes are frozen). Uncover, and season with salt and white pepper.
Stir-fry everything together for 2 minutes over medium heat. The sauce will thicken and the rice cakes should be cooked through, but still have a pleasant chewiness. Plate and serve!