Put the crème fraîche, vanilla sugar and egg in a bowl. Grate the peel of an untreated orange and scrape the vanilla pulp from the pod.
Add both and stir well, then chill.
Roll out the puff pastry and dust with cinnamon, then roll up again. Cut 2 - 3 cm pieces. Press the pieces flat and place in a muffin tin. Make a groove in the middle of the pieces with your thumb. Bake in the grill or oven at 180 degrees 8 minutes before.
Take it out and deepen the well with a teaspoon and fill it up with the cold cream. Bake for another 10-12 minutes. Goes well with: caramel sauce.