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Beat butter and both sugars with an electric mixer until fluffy.
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Add eggs, one at a time, and beat well after each addition.
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Add grated peel and lemon juice and bleat until well blended.
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Add flour, baking soda and salt to butter mixture, beating until just blended.
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Divide into 3 equal pieces and roll each piece, on wax or parchment paper, into a 12 inch log.
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Wrap and chill for 8 hours. I usually make up the night before I want to bake them.
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Cut each log into 1/2 inch slices and place on lightly greased baking sheets.
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Bake at 350º for 12 to 14 minutes until edges are lightly browned.
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Remove to wire racks to cool.
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Store in an airtight container or freeze.