• 01.055 And pork-pie

A round pastry-encapsulated dish of chopped meat with a bit of pork gelatin and more or fewer spices depending on your region.  A pork-pie hat is similarly round with a small brim.

The hyphen is found in the OED examples.

“pork pie, n.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/147997. Accessed 19 September 2017.