Soak scan bran in boiling water and mash.
Add egg yolks sweetener, cocoa and orange flavouring and mix until smooth.
In a separate bowl whisk egg whites to soft peaks and fold into mixture.
Place into a microwavable container and microwave for 5 mins.
Take out and place into a plate/cooling tray.
For the topping
Mix quark, sweetener, orange flavouring and cocoa and mix well.
When the cake is cooled top with frosting and orange zest.