1.
In the bowl of an electric mixer, combine egg whites, lemon juice, and vanilla and beat on low speed for 30 seconds. Add confectioners’ sugar, one cup at a time, and mix on low speed until incorporated. Stop and scrape down the bowl a few times. Once all the sugar has been added, beat at high speed for five minutes. The mixture will thicken and become shiny.
2.
Stir in teaspoons of boiling water by hand until the icing is the consistency of toothpaste. If the icing gets too loose, add some confectioners’ sugar. If the icing gets too thick to spread, then add a few drops of water until it becomes spreadable.
3.
Divide icing among bowls if you are making several colors. Add gel food coloring and mix well. Use this thick icing to make a border on your cookies. When you are ready to fill in the border, add one to two teaspoons hot water to the icing and mix in so that the icing is looser.
4.
Place the icing into a pastry bag or squirt bottle. Squeeze the icing onto the cookie to “flood” the inside of the border, and move the tip around to fill in the gaps. Let dry and add more décor as desired.
will it also come out nice with regular sugar cookies