Also known as mutton pies, these have a very long history. In the middle ages, they were frowned upon by the Scottish church, viewed as luxurious, decadent English-style food. In later centuries, they proved to be convenient and sustaining snacks for working people, who would buy them hot from pie-men or pie-wives in the city streets. The space on top of the pie, created by the raised crust, would sometimes be filled with gravy, beans or mashed potato.
This crowd-pleasing bread sauce recipe by Nigella Lawson is an easy extra for Christmas Day and is just as good served cold with leftovers. The recipe appears in Nigella's book Feast, published by Chatto & Windus.