Continue until you've covered the pastry with dabs. Fold both sides into the middle. Continue dabs on the left side then fold in half, turn and dab left side, fold in half again. (You have created layers with butter trapped between) Refrigerate for at least 2 hours. When ready, preheat oven to 425º. Gently roll into a square block about ½ inch thick. Cut pastry into narrow fingers and twist slightly. Place on lined baking trays, brush with milk and sprinkle with extra cheese of your choice. Bake for 25 minutes until golden brown and crispy