3-1/4 cups (or more) powdered sugar, sifted
2 large egg whites
1 teaspoon strained fresh lemon juice
Assorted food colorings (optional)
Using electric mixer, beat powdered sugar and egg whites until thick and shiny (adding more powdered sugar by tablespoonfuls if mixture is too thin to spread), about 3 minutes. Add lemon juice and mix. Divide icing into portions, if desired, and add a different food coloring to each if you like.