Step 1

Mix the flour and salt together in a bowl. Rub in the chilled butter using your fingertips until the mixture resembles breadcrumbs. Gradually add enough water to form a dough (about 4-6 tablespoons of water).

Step 2

Roll the dough out into a rectangle on a lightly floured work surface.

Step 3

Grate half of the frozen butter over the bottom two-thirds of the dough. Fold down the top third and fold up the bottom third as if folding a letter.

Step 4

Turn the folded dough 90 degrees and roll it out into a rectangle again. Repeat the process of adding the remaining frozen butter and fold as before.

Step 5

Wrap the dough in cling film and leave to rest in the fridge for 30 minutes before using.