Preheat oven to 150 degrees C. Grease a deep 22cm round cake pan; line base and sides with baking paper.
Combine the butter, chocolate, sugar and water in a medium saucepan; stir over low heat until mixture is smooth.Transfer mixture to a large bowl; cool 15 minutes. Whisk in flours then essence and eggs.
Pour cake mixture into prepared pan. Bake for about 2 hours. Stand in pan 10minutes; turn onto a wire rack to cool.
For the caramel icing: Melt butter in a small saucepan; stir in the brown sugar and milk. Bring to the boil; simmer,uncovered, for 3 minutes. Cool 10 minutes. Gradually stir in icing sugar until frosting is thick.
Place cake on a serving plate; spread cold cake with caramel frosting.
While I have made a cake or twenty in my time, it was also my first time making a mud cake of any kind. All I can say it was very easy, and the result is fantastic.
Only one hint is if you plan to use a spring tin, make sure when lined it is water tight as this mix is very very wet. - 05 Jun 2011
what a fantastic recipe. Thought I'd try this one instead of my usual and was shocked at flavor, texture and moisture. Don't make any other one but this. Have to say that I did use 000 plain flour because I didnt have the normal one and this may have contributed to the perfect texture. - 14 Jan 2013