1/2 cup butter, softened
1 cup granulated sugar
1 large egg
1 tablespoon fresh lime juice
Grated rind of 1 lime
1 1/3 cups all-purpose flour
1 teaspoon baking powder
1/2 teaspoon salt
Sugar for sprinkling on cookies
Beat together butter, granulated sugar, and 2 tablespoons lime sugar with an electric mixer until light and fluffy. Beat in egg, lime juice and grated rind.
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Sift flour, baking powder, and salt together then add to egg mixture.
Form dough into a 10-inch log and wrap in wax paper. Chill dough until firm, at least 4 hours.
Preheat oven to 375 degrees F. Foil- or parchment-line cookie sheets.
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Remove wax paper and cut log into 1/4-inch-thick rounds. Place cookies on prepare cookie sheets. Sprinkle tops with sugar and bake for 10 to 12 minutes, or until pale golden. Remove to wire rack to cool.
