To make the détrempe (dough packet), melt the butter in a small pan or in the microwave and then set aside to cool. Put the flour into a large bowl and make a well in the centre. Add the water and mix it together with a wooden spoon. Then add the vinegar (this will help to give a more tender puff pastry) and the melted butter along with the salt and stir to combine.
Knead the dough for