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PREHEAT OVEN TO 350 degrees F.
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Spread almonds on a baking sheet and toast them in oven until lightly golden.
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Let cool.
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Coarsely chop half the nuts.
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Butter 2 large baking sheets.
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Mix flour, sugar, salt and baking soda.
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Beat in eggs, then whole and chopped nuts.
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Mix to obtain a firm dough.
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Knead briefly, then divide dough into 2 pieces.
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On a floured work surface, roll each piece under your hands into a cylinder 15 inches long and about 1 1/2 inches in diameter.
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Place 2 rolls, well separated, on each baking sheet and bake 15 to 20 minutes, until very lightly browned and firm to the touch.
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With a spatula, carefully transfer the rolls to a cutting board and slice each onediagonally into cookies about 1/2-inch thick.
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Set wire racks on the baking sheets and lay out the biscotti on them.
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Return them to the oven for 20 to 30 minutes, or until very firm and crisp.
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Cool on the racks, then transfer them to a tin for long keeping.