Form a ball with the flour and the salted water, then roll it out in a square. Spread the soften butter on all it surface. Fold the dough in four starting by the tip of each corner. Set to rest for 10 minutes.
Sprinkle the apples with the vanilla sugar, the Armagnac and the orange blossom water. Stir. Roll out the dough one more time and fold it in three thirds. Repeat this operation 6 more times with a 10 minutes resting period between each turns.
Line a buttered mold with some of the dough, place the apples in the center, then cover with the rest of the dough sealing the edges. Cook in a medium oven for 30 minutes. Sprinkle your pie with the sugar a soon as it comes out of the oven.
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