Make a flour paste by mixing the flour with 150 ml of water and 50 g of softened butter. You should have a pliable dough.
Knead the remaining butter; it must give up all of its moisture content. Roll the flour dough into a square 1 cm thick. Roll the butter out into a square shape and place it in the centre. Close up like a wallet.
Roll into a rectangular shape and fold it in three. Chill for 30 minutes and repeat the process in the opposite direction. Do this three times. For a sweet flaky pastry, dust with icing sugar each time you roll out the dough.