For the sponge cake, beat the egg with the hot water for about 1 minute until frothy, then add sugar and vanilla sugar. Beat through for another 2 minutes. Mix flour with cornstarch and baking powder and stir in. Pour the dough into a prepared mold.
Bake in the preheated oven at 160 ° C on the middle rack for about 20-30 minutes until golden yellow.
For the meringue crumbs (easy to prepare), stir the egg whites until frothy, gradually add 200 g of sugar. Mix the other 200 g sugar with the 60 g hazelnuts and pudding powder and fold in. Spread the mixture on a baking sheet lined with baking paper.
Bake in the preheated oven at 140 ° C for approx. 1 hour or leave to dry.
For the brittle (is also easy to prepare), melt 50 g of chopped almonds with 50 g of sugar and 1 tablespoon of butter in a pan. Stir while cooling, otherwise you will have a single brittle chunk.
Tip: You can of course also use brittle that has been bought. But it doesn`t taste that good.
After baking, grate the finished cold meringue base into crumbs with a food processor (or other grater).
For the filling, whip the cream and mix with 100 g of sugar.
Layer the cake in a size 30 loaf pan lined with foil (it is best to use a cut freezer bag): Below the cooled sponge cake base - one layer only cream - chocolate shavings - mixed cream and meringue crumbs (about 5 tablespoon cream and 10 tablespoon meringue crumbs) - one thin layer only cream - meringue crumbs - 7 tablespoons of cream mixed with 6 tablespoons of meringue crumbs and 2 tablespoons of brittle - only cream as the top layer. Sprinkle the cake with chocolate chips and brittle on top
Freeze the cake for at least 3 - 4 hours. Take out of the freezer approx. 15 minutes before serving.
Tip: If there are any meringue crumbs left - these are durable and can be used, for example, as an accompaniment to vanilla ice cream.