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["Preheat oven to 350u00b0. Toast pecans on a rimmed baking sheet, tossing once or twice, until lightly browned and beginning to smell nutty, 5-8 minutes (do not toast them all the way; they will get baked again). Let cool. Turn off oven.", "Pulse pecans, buckwheat flour, salt, baking powder, and 1 cup all-purpose flour in a food processor until pecans are finely ground.", "Using an electric mixer on medium. high speed, beat butter, powdered sugar, and vanilla until light and fluffy, about 4 minutes. Reduce speed to low and mix in dry ingredients just to blend. Divide dough in half; wrap each in plastic wrap, flattening into 1/2""-thick disks. Chill until very firm, at least 2 hours.", "Working with 1 piece at a time, roll disks of dough between 2 lightly floured sheets of parchment paper to about 1/8"" thick. Transfer to a baking sheet and remove top sheet of parchment. Chill 30 minutes.", "While dough is chilling, mix granulated sugar, sesame seeds, and poppy seeds in a small bowl. Reheat oven to 350u00b0. Using a knife or pastry cutter, cut out 2"" squares or diamonds from dough and space out on baking sheet, about 1/2"" apart. Sprinkle with sesame mixture and bake cookies until golden brown around the edges, 10-12 minutes. Transfer cookies to wire racks and let cool before serving.", "Do ahead: Dough can be made 5 days ahead; keep chilled. Cookies can be baked 2 days ahead; store airtight at room temperature."]
