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1
Preheat the oven to 350u00b0. Spread the chopped pecans on a rimmed baking sheet and toast for about 6 minutes, until lightly browned and fragrant. Let cool.
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2
In the bowl of a standing mixer fitted with the paddle, beat the butter with the confectioners' sugar, vanilla bean and seeds, vanilla extract and salt at medium speed until fluffy, about 3 minutes.
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3
Add the flour in 3 batches, beating at low speed until just incorporated.
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4
Discard the vanilla bean.
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5
Stir in the pecans.
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6
Transfer the dough to a work surface and roll into a 1 1/2-inch-thick log. Wrap the log in plastic or parchment paper and refrigerate for about 1 hour, until chilled.
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7
Line 2 large rimmed baking sheets with parchment paper.
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8
Spread the turbinado sugar on a platter.
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9
Brush the log with the egg yolk and roll in the sugar.
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10
Slice the log into 1/2-inch-thick rounds. Transfer the rounds to the prepared baking sheets, spacing them 1 inch apart.
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11
Bake the shortbread cookies for about 20 minutes, until the edges are golden; rotate the baking sheets from top to bottom and front to back halfway through baking.
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12
Transfer the cookies to a wire rack and let stand until cooled completely, about 30 minutes, before serving.