Shepherd's pie when the potato was being introduced as an edible crop affordable for the poor (cf. "cottage", meaning a modest dwelling for rural workers). The term "shepherd's pie" did not appear until 1854, and was used synonymously with cottage pie, regardless of whether the meat was beef or mutton. In the United Kingdom, the term "shepherd's pie" is now commonly used when the meat is lamb. In early cookery books, the dish was a means of using leftover roasted meat of any kind, and the pie dish was lined on the sides and bottom with mashed potato, as well as having
Squab pie pie", as it stems from a disagreement over whether to have a meat or apple pie. There are many variations to the squab pie in England, although it traditionally includes mutton, it has come to mean a pie with many ingredients or a "scraps pie". Squab pie in Devon can be served with clotted cream. Alternatively, in America, it is cooked with squab, and is synonymous with pigeon pie. Squab pie is a mutton pie with a shortcrust pastry lid. It should be made with at least one layer of onions, followed by alternating layers of sliced apples and mutton