Heat up the frying pan with a tad bit of oil. Add chopped onions and fry until translucent.
Then dump in all the things that you'd like to find inside the pie...... the meat(s) of your preference, mushrooms, capsicums, sun dried tomatos (mmm...)..........whatever takes your fancy!
A wee bit of white wine or vinegar helps to infuse the flavours together.
Don't forget the salt and pepper!
Grease and line up the pie dish with pastry dough.
Chuck the filling into the pie base, add tons of grated cheese, and if you, like me find that the filling is not enough to fill-in the whole dish, just think of something to make it full, maybe pieces of bread or some leftovers or something.
Use another pastry sheet to cover up the pie. Leave an incission on it to let the steam escape.
And pop it in the oven (pre-heated of course).
Your nose will alert you when it's done
Enjoy!