Whip the egg whites to a hard foam. Add the sugar.
Stir the egg yellows and the starch together and add it with the egg whites and the sugar.
Spread it out on a baking paper using a spatula.
Powder the icing sugar on top.
Preheat the oven at 200 degrees Celsius.
Bake the cake bottom for 10 minutes. Take it out and let it cool down.
Melt the jam in a casserole and spread it out on a baking paper. Let it cool down completely.
Spread it over the biscuit.
Melt the chocolate slowly in a water bath. Mix it with the butter.
Mix the egg whites and the egg yellows to hard foam in two different bowls, and mix it gently in to the batter.
Spread half of the chocolate mousse evenly on top of the jam.
Cut the cake in 6 pieces.
Place one cake on top of another one. Cover with the rest of the chocolate mousse.
Make nice pattern and decorations on top of the cakes.
Place them cold until it is time to serve.