Use a mixer to mix the flour, butter, egg, sugar and salt into a firm dough. Cover and let rest for at least 1 hour.
Peel, quarter and core the apples.
Caramelize sugar in a pan, add butter, remove from heat and spread the apples on top.
Roll out the dough round and place it on the pan / tart dish with the apples.
Bake in the preheated oven at 200 ° C for a good 20 minutes.
Halve the vanilla pod lengthways and scrape out the pulp. Put both in a saucepan with 200 ml of milk and the sugar. Bring this to a boil, stir in the pudding powder or starch with the remaining milk and egg until smooth. So that the boiling liquid binds and stirs.
Turn the tart out immediately after baking and serve with the vanilla sauce.