Millefeuille
Step by step recipe:
- 20 min.
The day before, or several hours before, make crème pâtissière (confectioner's custard).
Roll out puff pastry as thinly as possible. Then put on a baking sheet in the fridge for about one hour, so that if it needs to shrink, it happens in the fridge instead of the oven.
It is very difficult to make a regular rectangle (see photo) but don't worry about that.
Preheat oven to 410°F (210°C). - 30 min.
Put a sheet of cooking parchment onto pastry and place a cooling rack on top. We do that to stop puff pastry swelling too much during cooking, essential for millefeuilles.
Put in the oven for about 30 minutes, but remove paper and rack after 20 minutes to allow pastry to brown. - 15 min.
When pastry is cooked, remove from the oven, allow to cool a little and put on a rack to finish cooling. - 5 min.
With a bread knife or steak knife, trim the edges of puff pastry to get a regular rectangle (you can use a ruler to help with this). - 3 min.
Cut the rectangle into three. (use the first piece as a template to cut the others to the same size)
Look at the three parts to determinate the best looking, that means flat, regular and brown. This will be the top of your millefeuille. - 1 min.
Make 150 g Chantilly cream and fold it gently into crème pâtissière, with a maryse by turning with the bowl tipped at an angle. 
You will get a delicious vanilla cream, light and perfumed.- 3 min.
On the serving plate (quite impossible to move a millefeuille when finished without catastrophe), put the least pretty piece of pastry. - 5 min.
With a forcing bag full of cream, pipe small balls or rosettes of cream... 
... over the whole surface.- 2 min.
Then gently add the second piece of puff pastry. - 5 min.
Cover with more piped balls of cream. - 10 min.
Mix 1 tablespoon water with 4 tablespoons icing sugar to make a glacé icing, and spread over top of last (and best) piece of puff pastry.
You can also add trails of melted chocolate, but it's not easy to do well.
If you want to be sure of quick success, just sprinkle top with icing sugar. - 3 min.
And finally, place the last puff pastry piece on top.
Your millefeuille is ready to serve.
Remarks:
Millefeuilles can be made in an infinite variety of shapes and flavours, but keeping to this basic principle: 2 layers of something soft between 3 layers of something crispy. Just by keeping puff pastry and replacing vanilla cream with a layer of raspberries or strawberries and a lime cream, it's extraordinary.Be careful!: You can put your millefeuille in the fridge to wait, but not too long: 4-5 hours maximum, never more, never overnight! Because eventually the cream will soak into the pastry, and you will get that horrible limp thing that bad bakers try to pass off as millefeuille.
Source:
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This recipe use (among others)
Puff or flaky pastry (pâte feuilletée): You can get more informations, or check-out other recipes which use it, for example: Ham "friand" pie, Maroilles cheese quiche, Crusty cockle tart, Apple and pear tart, Leek and fresh tuna tart, ... [All]
Confectioner's custard (Crème pâtissière, or French pastry cream): You can get more informations, or check-out other recipes which use it, for example: Strawberries with mint and cream, Pear and lime meringue pie, Fraisier (French strawberry cake), Paris-Brest, Puits d'amour, ... [All]
Chantilly cream: You can get more informations, or check-out other recipes which use it, for example: European glass, Cranachan, Belle-helene in a glass, Pavlova, Coupe Augustin, ... [All]
Icing sugar: You can get more informations, or check-out other recipes which use it, for example: Coconut paste, Little Christmas biscuits, Mini lemon millefeuilles, Arizona cupcakes, Amaretti, ... [All]