INGREDIENTS
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1/4 cup sugar
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2 teaspoons cornstarch
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2 large egg yolks
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1 teaspoon freshly grated lemon zest plus 1/3 cup juice (about 3 lemons)
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1 tablespoon unsalted butter, cut into small pieces
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1 1/2 cups all-purpose flour
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1/2 teaspoon baking powder
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1/2 teaspoon kosher salt
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1 stick (8 tablespoons) unsalted butter, at room temperature
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1/2 cup sugar, plus more for rolling
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1 large egg, at room temperature
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2 teaspoons freshly grated lemon zest
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1/2 cup sugar
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2 large egg whites
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1/4 teaspoon pure vanilla extract