Chocolate Cake with Fudge-esque icing!

This strange cake is also taken from "Sam Stern's Student Cookbook", like the cloud cake. What is so weird about this cake, is that instead of eggs, it uses mayonnaise. Honestly. But don't fret - as promised in the cookbook you wont taste the mayo at all! The icing is AMAZING, it is quite honestly the yummiest chocolate based icing I have ever tried. I have a feeling I will be using it more often!

Ingredients;
-275g white self raising flour
-1 1/2 tbsp baking powder
-225g sugar
-200g Mayonnaise
-225ml boiling water
-4 tbsp cocoa powder
-1 tsp vanilla extract

For the icing;
-275g Icing sugar
-25g cocoa powder
-110g butter
-3-4 tbsp water

Preheat the oven to 180C. Grease a 8inch (20.5cm) cake tin.
Sift the flour, baking powder and sugar into a bowl. Beat in the mayonnaise - don't worry that it's lumpy, it's supposed to be that way!
In a separate bowl, pour boiling water over the cocoa and vanilla extract. Stir, and then pour into the main mix. Beat until soft and creamy.
Tip all this into the cake tin, and bake for 40 minutes.

I was stupid and kept opening the door, so it didn't rise as much as it should have (although looking back I may also have used the wrong flour...although I'm not 100% sure!)
In the oven...mmmmm



After ten minutes of cooling time, tip the cake out of the tin, and leave to cool.

Whilst it's cooling, make the icing! Sift the sugar and cocoa. In a pot, gently melt the butter and water without boiling. Add this to the sugar gradually - you may not need all of it. The mixture should be smooth, and not too runny. Pour this over the cake, and decorate!