How to cook
In bowls, separate the egg whites from the yolks. Add a pinch of salt to the egg whites and beat them with a mixer for 5 minutes until a foamy mixture is obtained.
Add the sugar to the yolks and beat them until a smooth mixture is obtained, about 10 minutes.
Sift the flour with half a teaspoon of baking powder and a pinch of salt. Add the flour to the beaten yolks in portions. Carefully add the beaten egg whites.
Cover the oven tray with a piece of baking paper. Grease it lightly. Pour the sponge cake mixture.
Smooth it out and bake the sponge cake layer at 370°F (190 degrees) for 5-6 minutes. Turn the sponge cake layer onto a towel and roll it up. Leave it to cool completely.
Place them diagonally on the larger piece.
Spread them with chocolate. With a fork, make groovy marks and decorate the Christmas tree to your liking.