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In a small saucepan, add the catsup, sugar, water, vinegar, lemon juice and soy sauce.
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Stir well to blend and place over medium-high heat.
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Combine cornstarch and cold water in a small dish and whisk, making sure there are no lumps.
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Just before sauce mixture comes to a full boil, whisk cornstarch and water again and slowly add to the sauce.
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Continue to heat and stir until sauce thickens.