For the sponge cake: Separate the egg yolks and egg whites. Mix together egg yolks and sugar. Add water and oil and mix it well. Finally add flour, cocoa powder, baking powder. From egg whites make meringue and mix it slowly with the rest of mixture.

Cover the baking tray with baking paper and pour the mixture in the tray. Bake on 180°C for 35min.

For the cream: separate the egg yolks and whites. Mix the egg yolks and sugar. Slowly add mascarpone cheese. From egg whites make meringue and mix it slowly into cream.

Baked sponge cake cut in half. Over every layer of cake spill some water, mix with sugar and rum. Make 4 layers. Layer of cake, then layer of half cream, layer of cake and the last layer of the rest cream. On the top sprinkle with dark cocoa.

Then let it rest for 3h in fridge.