Whip whites, then still whip and add step by step yolks and sugar. Then add flour and baking powder. Mix gently. Pour cake into greased form and bake 25 minutes. Cool it down.
Boil 2 cups of milk. Melt potato flour, sugar and yolks in 1/2 cup of milk. Add mixture to boiled milk and boil. Then use it to mix with butter.
Put on sponge cake 1/4 of mixture. On mixture put berries and 1/4 of mixture. Then put biscuits and rest of cream. Sprinkle cake walnuts and sultanas. Decorate using chocolate topping.
Bon appetite! | 
