Cut up meat into small bite-size squares. Mix onions with meat. Add squared (small bite size) potatoes to meat and onions. Salt and pepper and mix in a large bowl.
Prepare bottom crust (pie dough) in pie pan. Pour meat and potato mixture into shell. Place 4 pats of butter on top and cover with top crust. DO NOT cut holes in top of crust. Seal crusts well. Bake in 375 degree oven on middle rack for 1 hour. Watch that crusts do not burn. Oven temperature may vary to 350 degrees.