Marshmallow Frosting
3 egg whites
480g white caster sugar
3 teaspoons light corn syrup (difficult to get over here -- various places suggest substituting with agave nectar, using golden syrup (although the consistency's not quite right), using glucose syrup, or making your own sugar syrup. When I've made this before it's been from a slightly different version of the recipe in another book that my mother has, and I think that that version used golden syrup)
1/4 teaspoon cream of tartar
150ml water
3/4 teaspoon vanilla extract
food colouring
MAKES Enough frosting for 24 cupcakes
KEEPS Does not keep. Use immediately
In a metal bowl combine the egg whites, sugar, corn syrup, cream of tartar and water.
place the bowl over a saucepan of simmering water (making sure the bottom of the bowl does not touch the water) and beat continuously with a hand-held electric mixer until the mixture is light and fluffy and forms soft peaks.
Take the bowl off the heat and add the vanilla and food colouring. Whisk the mixture until it forms stiff peaks.
(Source: The Crabapple Bakery Cupcake Cookbook)