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1
Trim off and discard any silver skin from pork (do not trim fat). Cut pork across grain into 1/4-inch-thick slices, then toss with 1 tablespoon soy sauce, 2 teaspoons cornstarch, and 1 tablespoon sugar in a bowl.
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2
Stir together vinegar, salt, remaining 1 1/2 tablespoons soy sauce, and remaining 1/2 tablespoon sugar in a small bowl.
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3
Stir together water and remaining 2 teaspoons cornstarch in a cup.
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4
Rinse cabbage in a large colander. Tap colander lightly, then transfer cabbage to a large bowl with water still clinging to leaves.
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5
Heat 1 tablespoon oil in a 12-inch nonstick skillet over high heat until hot but not smoking, then add pork in 1 layer as quickly as possible. Cook, undisturbed, until pork begins to brown, about 3 minutes, then turn over and cook, undisturbed, until browned but still pink in center, about 1 minute more. Transfer pork and any juices to a plate. Do not clean skillet.
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6
Heat remaining tablespoon oil in skillet over moderately high heat until hot but not smoking, then stir-fry garlic and ginger 30 seconds. Add half of cabbage and stir-fry over high heat until cabbage is wilted, 2 to 3 minutes. Stir in remaining cabbage (skillet will be very full), along with any water in bowl, and soy sauce mixture, then cook, covered, stirring occasionally, until all of cabbage is tender, 4 to 5 minutes.
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7
Add pork, along with any juices accumulated on plate, and bring to a boil. Stir cornstarch mixture, then pour into skillet and boil, stirring, until sauce is slightly thickened, about 1 minute. Season with salt, then serve sprinkled with cilantro.
