Knead the flour, butter, sugar, water, egg and salt into a shortcrust pastry, put in the fridge.
In the meantime, peel and core the quinces and cut into wedges.
Roll out the dough, place in a greased springform pan (26 cm diameter), pull up a 2 cm high rim and prick several times with a fork. Top with the quince and bake at 180 ° C for about 30 minutes.
In the meantime, stir the eggs with sugar, vanilla sugar and cinnamon until foamy, stir in the crème fraîche and cream, place on the pre-baked cake and bake at the same temperature for another 35-40 minutes.