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1/3 cup sugar
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1 tablespoon cornstarch
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1 cup water
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1 tablespoon unsalted butter
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3 tablespoons fresh Lemon juice
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3 tablespoons fresh lime juice
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4 very thin lemon, slices
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4 very thin lime, slices
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1 teaspoon vanilla extract
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1 drop yellow food coloring, (optional)
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