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IN food processor, mix flour, sugar and salt. Pulse briefly to mix. Add chilled butter and lemon rind, pulse 10 to 12 times or til butter mixture resembles coarse oatmeal. With food processor running, add ice water all at once. Process for about 10 second until a ball of dough forms. Turn dough onto a sheet of plastic wrap. Flatten to form a 7 inch circle. Wrap dough tightly and refrigerate at least 1 hour