Chill all ingredients and equipment before starting
Mix flour and salt in a bowl
Cut cold butter into small pieces
Add cold butter to the flour and toss lightly
Add ice-cold water gradually
Mix just until the dough comes together
Shape the dough into a rectangle
Wrap the dough and chill it
Pound the remaining butter into a flat block
Place the butter block on the dough
Fold the dough over the butter to enclose it
Roll the dough into a long rectangle
Fold the dough into thirds
Chill the dough
Repeat rolling and folding several times
Chill between each turn
Rest the dough before using
Roll the finished dough to the desired thickness
Cut and shape as needed
Bake in a hot oven until puffed and golden