Beat the eggs with the sugar and vanilla sugar, add the flour mixed with baking powder and cocoa and then easily stir.
The prepared mixture, put it in the pan covered with baking paper, and put in a preheated oven to bake for 15 minutes at 180 degrees (356 Fahrenheit).
Baked sponge cake, wrap in the roll with baking paper and leave to cool.
For the filling, beat the eggs and sugar in foam and cook them on steam with constant stirring (about 15 minutes)
at the end, add grated chocolate and stir until all chocolate is melted. Then leave the filling to cool down in the fridge . Once the filling has cooled, put the butter and crushed almonds and mix well.
The peeled bananas sprinkle them with lemon juice, unwind the sponge cake, remove thebaking paper , place the filling, put at the beginning two rows bananas. Roll the sponge cake into a roll and apply outside of the filling.