For the apple mixture, peel and core the apples, cut into cubes and place in a saucepan. Together with the vanilla sugar, the calvados, the juice of a lemon and the cinnamon stick, simmer the apples for about 10 minutes, then leave to cool.
To make the brittle, finely chop the nuts. Put the sugar in a pan and let it caramelize. Add the butter and nuts and stir constantly. Then place the browned nuts on a board, cover with baking paper and roll out the brittle with a rolling pin. Let the brittle cool down.
Put the Greek yogurt in a bowl. Fold in the pulp of the vanilla pod, honey and some cooled brittle pieces.
Garnish the dessert in dessert bowls: First some yoghurt, then the apple mixture, some more yoghurt and the remaining brittle pieces as a garnish.