Frosting for Carrot Cake

400g icing sugar
110g dairy-free margarine
110g *vegetable shortening 
¼ teaspoon vanilla extract

What to do
Prepare the frosting by whisking all the ingredients together until light and smooth. 
Spread the frosting on top and down the sides of your cake.
* I use TREX for my vegetable shortening.  It is lighter in colour than dairy-free margarine which gives a fantastic and tasty alternative to the traditional cream cheese frosting on carrot cakes.