In the bowl of your stand mixer (with the flat beater or the rotary beater) or in a hand mixing bowl, pour the flour, salt and butter cut into pieces.
Start by roughly mixing the ingredients and gradually adding water until a ball forms. The dough will be sticky, which is normal.
Shape the dough into a ball, wrap it in plastic wrap, and refrigerate for 1 to 2 hours.
Place the ball of dough on a large sheet of floured parchment paper and flatten it into a square, lightly flouring the surface.
Roll out the square lengthwise to form a rectangle, flouring the surface as you go.
Start by folding the bottom two-thirds of the dough over, then fold the remaining third over that. Rotate the dough a quarter turn (90 degrees), then repeat this process four times, for a total of five turns.See the diagram below. By kneading and flouring the dough, it becomes less sticky and easier to handle.
Then, wrap the dough in plastic wrap and refrigerate it until ready to use. It also freezes very well.