Grease the 12 troughs of a muffin tray. Unroll the dough and roll out slightly larger (approx. 26 x 45 cm). Cut out or cut 10 circles (each approx. 10 cm Ø) from the dough. Place the dough remains on top of each other on a little flour (do not knead!) and cut out 2 more circles.
Place the dough circles in the hollows, press on the edges and chill.
Preheat oven (electric cooker: 225 °C/circulating air: 200 °C/gas: see manufacturer). Cut the vanilla pod lengthwise and scrape out the pulp. Bring milk, vanilla pod and 1 teaspoon butter to the boil, remove pod.
Mix sugar, 2 tablespoons of flour and 1 pinch of salt and stir vigorously into the boiling milk. Bring to the boil again. Whisk vanilla pulp, egg and egg yolk. Stir in 2-3 tbsp. hot cream, then stir into the remaining cream.
Spread the cream into the hollows. Bake in a hot oven for 10-12 minutes. Sprinkle each tart with 1 teaspoon of brown sugar and caramelise using a kitchen gas burner or under the hot grill for 3-4 minutes.
Allow to cool for about 10 minutes, then remove from the wells. Serve tartlets lukewarm or cold.