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1
Preheat oven to 350 degrees F.
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2
Spread the nuts out in one layer on a jelly roll pan and bake them, stirring occasionally, until they are well browned, about 10 to 13 minutes (they will smell toasted and nutty).
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3
Transfer the pan to a wire rack to cool.
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4
In a food processor, grind the nuts with 1/4 cup of the flour.
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5
Set aside.
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6
Using an electric mixer, beat the butter and sugar until creamy and smooth, about 2 minutes.
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7
Add the vanilla and beat well.
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8
Sift together the remaining 1 3/4 cups flour, the salt, and the baking powder, and add it to the dough, mixing until just combined.
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9
Stir in the nut mixture.
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10
Form the dough into a disk, wrap in plastic wrap, and chill for at least 3 hours.
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11
Preheat oven to 325 degrees F.
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12
Roll the dough in between two sheets of waxed paper to 3/16-inch thick.
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13
Using a sharp knife, cut the dough into 1-inch squares, then cut the squares on a diagonal into triangles.
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14
Sprinkle the cookies with the turbinado sugar.
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15
Place them 1-inch apart on ungreased cookie sheets (do not re-roll the scraps).
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16
Prick the cookies with a fork and bake until pale gold all over, about 10 minutes.
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17
Cool on a wire rack.