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. Add flour and stir. Drop by teaspoonsful onto cookie sheets. Swirl the batter around with a spoon back until cookies are spread very thin and are almost transparent.