Combine flour, cornstarch, baking powder and salt, stirring well with a whisk. Add flour mixture to sugar mixture, stirring until well blended. Dough will be thick. Turn dough out onto lightly floured surface, divide in half, and roll or shape each half into 12 inch log.
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Combine powdered sugar, lemon juice and remaining extract, stir well with whisk. Drizzle mixture over warm logs. Immediately cut each log diagonally into 12 slices (do not separate slices). Cool 10 minutes, separate slices and transfer to wire racks to cool.
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