Finely dice the vegetables for the filling to make filling the pasties easier.
If the filling is to moist, drain off excess moisture in a colander. A cold filling will keep the dough from warming up when making the pasties and becoming too soft to work with
It is perfectly possible to freeze the pasties after baking.
Leave the beef out for the vegetarian version.
Add diced chorizo and/or chopped chillies for a more spicy version.