Fluffy Marshmallow Frosting

Adapted from [Cake Duchess|http://www.cakeduchess.com/2012/04/fluffy-white-icing-marshmallow-frosting.html]



In the bowl of a stand mixer fitted with the whisk attachment, add the egg whites. Let it stand while you do the next step.

In a saucepan over medium-high heat, whisk together the sugar, water, and cream of tartar. Bring to a boil and, using a candy thermometer, bring the mixture up to 245 degrees F.

Turn your mixer on high and beat the egg whites until frothy and forming soft peaks. Gradually pour in the sugar mixture. Beat the mixture for 7 minutes (setting a timer helps here). In the last minute, add your vanilla and any food coloring you may want.

Use to decorate cake, fill whoopie pies, put a dollop on top of your hot cocoa, etc.