In a large bowl, mix the flour and salt.

Add the cold, diced butter to the flour mixture.

Use a pastry cutter or your fingers to combine until the mixture resembles coarse crumbs.

Gradually add cold water, mixing until the dough comes together.

Form the dough into a rectangle, wrap in plastic wrap, and refrigerate for at least 30 minutes.

Roll out the dough on a floured surface into a large rectangle.

Fold the dough into thirds (like a letter) and roll out again.

Repeat the folding and rolling process 4-6 times to create layers.

Chill the dough again for about 30 minutes before using.

Preheat your oven to 400°F (200°C) and bake your pastry until golden brown.