It is made in Lancashire, England. You can also buy it in shops in Lancashire. It can be made in normal pie sizes, or in individual portion pies as well for sale at sporting events, etc. Under the name of Butter Pie, they were were made by a company called Ashworth Foods Ltd for sale at sports stadiums, but that company went out of business.
To make a Friday Pie, potatoes are parboiled and sliced, then put into a pie plate lined with pie crust. An onion is sliced and put on top of the potato. This is seasoned with salt, pepper and dabs of butter, then a top pastry layer is put on. The pie is then baked, and served hot.
Pie crust for top and bottom crusts
3 large potatoes, peeled
Peel the onion, cut in half, slice. Set aside.
Peel the potatoes. Cut into halves, parboil for about 20 minutes. You don’t want them to fall apart, just be soft.
Meanwhile, make your pie crust dough. Roll out half of it, use that to line the bottom and sides of a pie pan.
Drain potatoes, let cool a few minutes until you can handle them, then slice into the prepared pie tin.
On top of them, arrange a layer of onion slices. Sprinkle salt and pepper on these, then sprinkle dabs of butter about.
Top with top pie crust layer, then bake at 350 F (180 C) to 30 to 45 minutes until pie crust is golden brown.
Aka Butter Pie, Catholic Pie.
Wallwork, Melanie (12 August 2008). “PNE fans call for butter pies”. Lancashire Evening Post. http://www.lep.co.uk/pnenews/PNE-fans-call-for-butter.4379320.jp. Retrieved 2009-01-15.