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1. Prepare the batter: In a medium bowl, stir together the eggs, cornstarch, and flour. The batter should be liquidy enough to coat the pork. If the batter looks too dry, add 1 to 2 tablespoons of water and stir again. Add the pork and stir gently to coat. Let stand at room temperature for 10 minutes.
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2. Prepare the sauce: In a small bowl, stir together the water, ketchup, pineapple juice, cider vinegar, Worcestershire sauce, soy sauce, and sugar until the sugar is dissolved. Set aside.
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3. Heat the peanut oil in a wok until it registers 350u00b0F on an instant-read oil thermometer. Working in 2 or 3 batches, add the first batch of pork cubes and fry until golden brown on the outside and cooked through, 4 to 5 minutes. Remove the pork with a slotted spoon and drain on a plate lined with paper towels. Remove any excess bits of batter from the oil with a slotted spoon or fine-mesh strainer. Continue frying the rest of the pork.
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4. Transfer the oil to a heat-proof container. (It will take about 1 hour to fully cool, after which you can transfer it to a container with a tight lid to dispose of it.) Wipe up any food remains in the wok with paper towels, being careful not to touch the metal directly with your hands.
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5. Heat the remaining 1 tablespoon oil in the wok or a skillet over medium-high heat. Add the garlic and ginger and stir-fry until just aromatic, about 20 seconds. Add the pineapple and the sauce and stir to coat the vegetables. Let the sauce simmer for 2 to 3 minutes to allow the pineapple to become tender (about 1 minute for canned pineapple). Return pork to the wok and toss until well coated with the sauce. Transfer to a plate and serve.
