Meringue powder replaces the raw egg whites, which should not be eaten by anyone who is pregnant.
Ingredients
1/4 cup plus 1 tablespoon meringue powder
1 pound confectioners' sugar
7-8 tablespoons water
Lavender gel, paste, or liquid food colouring
Method
In the bowl of mixer fitted with paddle, mix meringue powder, sugar, and water on low. Mix until icing holds a line when a spatula is pulled through it, about 15 minutes. If making ahead, store in an airtight container, colour just before using by adding colouring a bit at a time, stirring with spatula.
Source
Martha Stewart Kids Magazine 2001