Beat only until thoroughly mixed. Separate dough in half. Preheat oven to 400 degrees F. Place one batch of dough on lightly floured pastry cloth. Turn dough to distribute flour on all sides and roll out to desired thickness. Cut out the cookies using a heart-shaped cookie cutter.
Transfer cookies to ungreased cookie sheets.
Sprinkle the tops of the cookies with colored sugar. Bake cookies about 8 to 10 minutes or until they're lightly browned. Transfer cookies to racks for cooling. Put egg white and sugar in small bowl. Add water, butter and vanilla and mix.