For the ground:
Mix 6 egg yolks (set the egg whites aside) with 12 tablespoons of sugar until creamy!!
Mix 200ml cold milk, 100ml oil, 6 tbsp (full) flour, 3 tbsp baking cocoa and 1/2 packet of baking powder and mix with the egg yolk. Pour the whole thing into a floured baking tray. Bake at 190-200g for about 30 minutes.
Beat the egg whites until stiff and add 10 tablespoons of sugar.
Bring 4 tablespoons of water to the boil with 10 tablespoons of sugar and while the egg white is still being beaten, pour in the hot syrup. This doubles the volume of the egg white! Be careful, you need a large bowl. Spread the egg white over the sponge cake base and then put it in the oven again at 130 degrees for 10 minutes!!
Melt 200 g of dark chocolate with 6 tablespoons of water and 8 tablespoons of oil and immediately spread over the cake!! Cut into pieces immediately!! Let cool down