Preheat oven to 350° F and put a kettle of water on to boil.
Place one pie crust in a deep-style pie pan. Prick crust with a fork several times and bake for 5-10 minutes.
In a large skillet with deep sides, sauté ground beef/lamb with onions. Season well with Lawry's, salt and pepper.
Mix well to combine.
When beef loses its pink color, stir in oats and beef broth or bullion cube. Then cover mixture entirely with boiling water. Simmer mixture for 10-15 minutes until water is mostly gone. Then stir in Worcestershire Sauce, dry mustard and spices.
Spoon the mixture into the partially baked pie crust and dot the top of the filling with diced butter. Place top crust on filling, crimp sides, vent crust, and bake for 1 to 1-1/4 hours. Make sure crust is slightly browned.