Fill a large pan with water.
Peel, core and finely slice apples and drop into water.
Drain water, leaving 1 tbsp and stew apples with 3 tbsp sugar and vanilla sugar under a lid until tender. (About 10 – 15 minutes).
Transfer cooked apple slices to a bowl and allow to cool.
In a large frying pan melt butter over a gentle heat, then add 125g sugar, stirring with a wooden spoon.
Once sugar has turned into a caramel with butter (this will take a few minutes) stir in the oats until they are golden and toasted. (Be careful not to burn).
Allow to cool.
Finally whip cream and place half the apple mixture into a bowl followed by half the toasted oats, then repeat and finish off with a layer of cream and decorate with grated chocolate.
Serve straight away or chill until needed.