01 -
Heat milk until steaming, but don't let it boil. Mix yolks with sugar, vanilla, and flour until combined and creamy. Slowly stir in hot milk while whisking. Put the mix over medium heat, keep stirring until it thickens. Chill completely in the fridge for an hour or more.
02 -
Set oven to 400°F. Sprinkle sugar on puff pastry and roll it out to measure 9 by 12 inches. Slice into a dozen 1-inch-wide strips.
03 -
Wrap each pastry strip around a horn mold, overlapping the edges slightly. Lay them seam-side down on a baking sheet lined with parchment.
04 -
Mix one egg with 1 tablespoon of water. Lightly brush it over the pastry, but keep it off the molds.
05 -
Bake for 15 to 20 minutes at 400°F until the pastry turns golden. Let them cool a little, then carefully slide off the molds.
06 -
Use a piping bag to fill the cooled pastry with the custard. Sprinkle powdered sugar on top before you dig in.