In large bowl, combine all ingredients except flour and citrus zest; beat until light and fluffy.

Add flour; mix well.

Divide dough into 3 bowls, add desired citrus zest. We added zest from a lemon to one bowl, a lime to another, and a tangerine to a third.

Shape dough into 3 disks.

Wrap dough in plastic wrap; refrigerate 1 hour for easier handling.

Heat oven to 375°F.

On floured surface, roll out 1 disk of dough at a time to 1/8-inch thickness. (Keep remaining dough refrigerated.)

Cut with lightly floured cookie cutters. Place on ungreased cookie sheets.

Bake at 375°F. for 6 to 10 minutes or until light golden brown.

Immediately remove from cookie sheets.

Allow to cool.