INGREDIENTS
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2 cups all-purpose flour
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1/4 cup cornstarch
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1/4 teaspoon salt
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1 cup (2 sticks) unsalted butter, softened
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1/2 cup powdered sugar
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1/2 teaspoon vanilla extract
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1 tablespoon lemon zest
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1 1/2 cup powdered sugar
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2 tablespoons fresh lemon juice
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yellow food coloring, optional
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yellow sanding sugar, optional