From Kenji Lopez-Alt “Wok”
For the Pork: Place the pork in a medium bowl, cover with cold water, and vigorously agitate it. Drain through a fine-mesh strainer set in the sink and press on the pork with your hands to remove excess water. Return the pork to the bowl and add the sugar, white pepper, wine, soy sauce, sesame oil, baking soda, and cornstarch. Stir vigorously with your fingertips or chopsticks for 30 seconds. Set aside for 15 minutes at room temperature or refrigerate for up to 8 hours.
Meanwhile, Make the Sauce: Combine the white pepper, water, and soy sauce in a small bowl and stir together until homogeneous. Set aside. Combine the cornstarch and water in a separate small bowl and stir with a fork until the cornstarch is dissolved.
Before you stir-fry, get your bowls ready: Marinated pork, Ginger, garlic, and pickled chilies, Cucumber and scallions, Sauce, Cornstarch slurry, Empty bowl for cooked ingredients, Serving platter.
For the Stir-Fry: Heat a wok over high heat until lightly smoking. Add 1 tablespoon (15 ml) of the oil and swirl to coat. Add half of the pork, spread into a single layer, and cook without moving until lightly browned, about 45 seconds. Cook, tossing and stirring frequently until barely cooked through, about 30 seconds longer. Transfer to a clean bowl and set aside.
Wipe out the wok and return it to high heat until lightly smoking. Add 1 tablespoon (15 ml) of the remaining oil and swirl to coat. Stir-fry the remaining pork in the same manner and add it to the same bowl.
Wipe out the wok and return it to high heat until lightly smoking. Add the remaining tablespoon (15 ml) oil and swirl to coat. Add the garlic, ginger, pickled chilies (if using), and scallions and cook, tossing and stirring constantly, until fragrant, about 30 seconds. Add the cucumber and scallions and stir-fry until just heated through, about 1 minute. Return the pork to the wok. Stir the sauce and add to the wok by pouring it around the edges. Stir the cornstarch slurry and add a splash. Cook, tossing, until the sauce thickens and the pork is cooked through, about 30 seconds longer. Adjust the sauce consistency with more cornstarch slurry if it is too thin or a splash of water if it is too thick. Transfer to a serving platter and serve immediately with steamed white rice.
