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Stir together chicken stock, sugar, vinegar, soy sauce, garlic powder, and salt in a bowl or large measuring cup.
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Cook, stirring every minute or so, until boiling. Boil for about a minute (or until sugar is dissolved).
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In a separate bowl, combine the corn starch and pineapple juice. Stir until the lumps are gone.
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Stir in the cornstarch mixture. If it's been sitting for a while, give it a quick stir before adding.
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Cook for about a minute or so, until the mixture is thickened.