Preheat the oven at 250 degrees Celsius.
Whip the sugar and the eggs for 4 minutes.
Add the flour, potato flour and baking powder and mix well.
Place a baking paper in a baking sheet. Pour the batter evenly on the paper.
Place in the middle of the oven for 5 minutes. Take out the cake and let it cool down.
Whip the cream and mix with the grated chocolate and coconut flakes.
Pour evenly on the cake and roll together.
Place in the fridge for minimum 1 hour.
Before serving the cake sprinkle some coconut flakes on the cake.