6 tablespoons unsalted butter, cut into small pieces and chilled
1/2 cup plus 1 tablespoon cold milk
Preheat the oven to 450°. Sift the flour, baking powder and salt into a large bowl. Cut the butter until the mixture resembles coarse meal. Pour in the milk and stir gently with a wooden spoon until the dough just comes together.
On a floured surface, pat the dough into a 1/2-inch-thick round. using a 2 1/2-inch biscuit cutter, stamp out 8 biscuits. Place the biscuits on a baking sheet and brush the tops with milk. Bake for 10 minutes, or until golden. Serve hot.