Heat the ½ cup frying oil in a small pot over medium-low heat (to warm it up for frying later).
While the oil is warming, set a wok on the other side of the stove and heat 1 tablespoon of oil over medium-high until it is hot but not yet smoking. Add the pork and stir-fry until just cooked through, 2-3 minutes, then remove it from the wok and set it aside, leaving the remaining oil in the wok.
Add the ginger, garlic, pickled chilies and scallion whites to the wok and stir-fry them until fragrant, about 30 seconds. Add the carrots and mushrooms and cook the mixture for 1–2 minutes, until slightly softened. Pour the prepared sauce mix into the wok and stir everything well, then add the stock (or water) to deglaze, scraping up any bits that have stuck to the bottom and sides. Bring the mixture to a simmer and cook everything for 2–3 minutes, until the sauce has reduced slightly. Return the pork to the wok and stir, then add the asparagus and then the greens and stir everything together.
Give the starch slurry a final stir, then add it to the wok and cook, stirring, until the sauce is thick and glossy. Turn the heat under the wok as low as possible , and cover the wok with a lid to keep everything warm.
Increase the heat under the small pot and bring the oil to about 410ºF (210ºC). (If you don’t have a deep-fry thermometer, check the temperature by adding a very small piece of the baked rice cracker to the pot; the oil is ready when it puffs up and floats quickly.) Carefully add half the rice crackers and deep-fry them until they are puffed and golden, about 2 minutes; repeat with the rest of the crackers. Transfer the fried crackers to a large serving plate. While the crackers are still hot, pour the warm pork mixture directly over them to create the dish’s signature sizzle. Garnish with the scallion greens.