1- First, prepare the dough
Put the flour on your work surface, make a small well in the center, add the water, salt and butter then mix well by hand. quickly form it into a ball and knead. cover with a cloth and let rest for 20 minutes in the fridge.
2- Wash your leek whites by splitting them in 4 lengthwise and passing them under running water (3 times) then cut them into thick rounds of approximately 1 cm.
3- In a pot melt
50g of butter and gently sweat your leek rounds. salt, pepper, add nutmeg and cover.
Cook for 10 minutes.
Then, sprinkle 40 g of flour over it and incorporate your cold milk, bring back to boiling while stirring constantly, taste and adjust seasoning.
Transfer to a baking sheet and let cool.
Roll out 2/3 of the dough then fill the mold to the top in such a way as to leave 1 cm of dough hanging over the edges, prick the dough at the bottom with a fork then put in the fridge for 30 minutes.
During this time preheat your oven to 220° (th8) and roll out the last third of dough which will serve as a cover for your flamiche.
After this resting time pour your leek custard into your tart
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