Mix the flour, ground nuts, 2 tablespoons of fat, sugar and vanilla sugar with the dough hooks of the hand mixer into crumbles. Chill for about 15 minutes.
Grease 4 small or 1 large casserole dish. Peel, quarter and core apples. Cut apple quarters into thin slices and sprinkle with lemon juice
Spread apples in the moulds and sprinkle with crumbles. Bake in a hot oven (electric cooker: 175 °C/circulating air: 150 °C/gas: level 2) for approx. 25 minutes
Coarsely chop the hazelnut kernels. Sprinkle Crumble with them and dust with icing sugar. Decorate with apple slices and lemon balm. Serve with vanilla sauce
The hazelnut crumbles can also be refined with a few drops of rum aroma or a little cinnamon