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["Preheat oven to 375 degrees.", "Place cranberries in a small bowl, and add 1/2 boiling water, or enough to cover.", "Let stand until cranberries are plump, about 15 minutes.", "Drain and set aside.", "In a medium bowl, sift together flour, baking powder, and salt; set aside.", "Line a baking sheet with parchment paper and set aside.", "In the bowl of an electric mixer fitted with the paddle attachment, cream butter and granulated sugar on medium speed until light and fluffy, about 2 minutes.", "Add 3 eggs, one at a time, beating to incorporate after each addition.", "Beat in vanilla.", "Add the dry ingredients, beating on low, until fully combined.", "Stir in drained cranberries and pistachios.", "Remove dough to a lightly floured surface.", "Divide in two.", "Roll each piece into a 2"" by 18"" log, and place on prepared baking sheet, leaving about 3"" between logs.", "Flatten logs slightly with palm of hand.", "In a small bowl, lightly beat remaining egg.", "Brush logs with beaten egg, and sprinkle with sanding sugar.", "Bake for 25 minutes.", "Remove from oven, and cool on a rack until warm to the touch, about 20 minutes.", "Place logs on a cutting board, and cut crosswise on the diagonal into 3/4"" pieces.", "Return biscotti to baking sheet, cut side down.", "Bake until biscotti are beginning to brown around the edges, about 12 minutes more.", "Transer to wire racks to cool."]
