This is what I'm fixing to make tonight. How about you? Cottage pie or shepherd's pie is a meat pie with a crust of mashed potato. The term cottage pie is known to have been in use in 1791, when the potato was being introduced as an edible crop affordable for the poor. (The term "cottage" meaning a modest dwelling for rural workers). In early cookery books, the dish was a means of using leftover roasted meat of any kind (it was a recipe to re-purpose left overs) , and the pie dish was lined with mashed potato as well as having a mashed potato crust on top.