"These classic shortbread cookies are made with butter, sugar, flour, vanilla, and salt. A simple approach to a Scottish tradition and Christmas cookie...."
INGREDIENTS
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1 1/4 cups all-purpose flour, plus more for the work surface
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7 tablespoons unsalted butter (3 1/2 oz), cubed and softened
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1/4 cup superfine sugar (or just blitz granulated sugar in a blender until finely ground but not powdery), plus more for the work surface
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2 drops vanilla extract
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Pinch fine sea salt (optional)