Italian Lemon Cookies

Directions

1. In a large bowl, cream butter and sugar until light and fluffy, 5-7 minutes. Beat in egg yolks and lemon zest. Gradually beat in flour. Refrigerate, covered, 1 hour or until firm enough to shape.
2. Preheat oven to 350°. Shape level tablespoons of dough into 6-in. ropes. Shape each rope into an S, then coil each end until it touches the center. Place 2 in. apart on ungreased baking sheets. Whisk egg whites; brush over cookies. Sprinkle with colored sugar.
3. Bake until bottoms are brown, 12-14 minutes. Remove from pans to wire racks to cool.