INGREDIENTS
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12 tablespoons (1 1/2 sticks), plus 1 tablespoon cold unsalted butter
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1 3/4 cups plus 3 tablespoons all-purpose flour
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2/3 cup confectioners' sugar, plus more for garnish
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1/4 cup cornstarch
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3/4 teaspoon salt plus a pinch
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4 eggs, lightly beaten
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1 1/3 cups granulated sugar
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1 1/2 teaspoons lemon zest
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2/3 cup fresh lemon juice, strained
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1/4 cup whole milk
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2 tablespoons limoncello, or other lemon-flavored liqueur, optional