Ingredients

2 large egg whites, plus more if necessary 

4 cups confectioners' sugar (sifted, then measured), plus more if necessary 

Juice of 1 lemon 

Liquid food coloring in desired colors 

Preparation

Put egg whites in the bowl of an electric mixer fitted with the whisk attachment; beat until stiff peaks form. Add sugar, lemon, and juice; beat 1 minute. If too thick, beat in more egg whites; if too thin, beat in more sugar.

Divide icing into small bowls and tint with a few drops of liquid food coloring as desired. Use immediately.