Peel the apples, cut into bite-sized pieces and place in a bowl. Scrape the pulp out of the vanilla pod and add to the apple pieces, as well as the sugar. Mix everything together and divide into small baking dishes. Then pour 1 tablespoon each of apple juice and chopped hazelnuts over the mixture.
Process the sugar, butter, cinnamon and flour into crumble and pour over the apple pieces.
Bake in the oven preheated to 180 ° C for about 15 minutes or until the crumble has the desired degree of browning.