This recipe has been a staple in our family for as long as I can remember and not much different from recipes of the era. Growing up with an estate which raised cattle, we often enjoyed roast dinners. This recipe is a great use for left overs, which Mrs. Patmore might very well have had ordered prepared for next day dinner in the servants hall.
Incorporate whatever leftovers you have…often we only have a small amount of roast, but the more meat you use, the larger your roll. I often have leftover roasted vegetables along with beef and I chop it all up as the filling. Gravy goes into the recipe as well, but save extra gravy to serve on top.