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1
Chop vanilla bean.
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2
Pound it in a mortar or pulverize it in an electric blender with about one tablespoon of the confectioner's sugar.
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3
Mix with the remaining confectioners' sugar.
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4
Cover and let stand, preferably overnight.
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5
Reserve while cookies are baked.
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6
Preheat oven to 350 degrees.
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7
Cut walnuts with a sharp knife into very small pieces.
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8
Pound the pieces to a paste, using mortar and pestle.
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9
With a wooden spoon or the fingers, mix walnuts, butter, granulated sugar and flour to a smooth dough.
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10
Shape dough, about a teaspoon at a time, into small crescents about one and a half inches in diameter.
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11
Bake on an ungreased cookie sheet until lightly browned, or 15 to 18 minutes.
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12
Cool one minute.
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13
While still warm, roll cookies in prepared vanilla sugar.