For the cake:
200g quality dark chocolate (70% cocoa)
250g plain cooked (vacuum packed) beetroot, drained & pureed
200g plain flour
200g unsalted butter, melted
100g dark brown sugar
100g caster sugar
3 large eggs
2tbsp cocoa powder
2tsp baking powder
1tsp vanilla extract
Icing sugar for dusting
For the icing:
250g mascarpone
300ml double cream
1-2 tbsp icing sugar