Line and prepare 2 cake tins. Preheat oven to 140 (fan assisted , 160 none assisted) degrees celsius
Grate the beetroot, drain of excess liquid and put aside.
Melt butter and cocoa and honey on a low heat. Leave to cool.
Whisk eggs and banana until they are fluffy.
Fold the nut flours into the eggs, then add the beetroot, chocolate sauce and coffee and gently fold in until thoroughly mixed. (At this stage taste mixture as you may want to add more sweetener or cocoa).
Divide into 2 cake tins and place in the middle of the oven for an 1hour - 1hr30mins (checking regularly as ovens vary and nut flours burn easy).
Then cover in foil for remaining half hour.
It should bounce back when cooked or leave no mixture when cocktail stick is inserted.
Allow to cool.
To make frosting melt coconut oil, coffee, honey and cocoa on a low heat. Allow to cool and add other ingredients.
Add the soured cream and very gently beat until it is thoroughly mixed.
Use to sandwich the cake together to to serve on the side. (The icing will go firm it put in fridge).