Mix everything at maximum power in a food processor or blender.
Spread a baking pan with coconut oil and flour and pour the mixture into it.
Bake in a pre heated oven at 170°C for 45 minutes or until the cake is golden brown.
Let it cool before unmolding.
Melt the chocolate in a bain marie (or in the microwave to make it easier) and pour over the top of the cake.