INGREDIENTS
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1 teaspoon baking powder
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1/4 teaspoon salt
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1 cup all-purpose flour, plus more for work surface
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3/4 cup plus 1 tablespoon cornstarch
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1/2 cup (1 stick) unsalted butter, softened
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1/2 cup plus 1 tablespoon granulated sugar
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2 large egg yolks, room temperature
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5 teaspoons finely grated lemon zest, plus 2 tablespoons fresh lemon juice
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1 teaspoon pure vanilla extract
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1 3/4 cups confectioners’ sugar
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1 1/2 cups shelled unsalted pistachios, toasted and coarsely chopped