Slow Cooked Beef and Potato Pie - Cow Pie

olive oil

large brown onion (peeled and chopped)

braising beef (chopped into bite-sized chunks)

plain/all-purpose flour

salt and pepper

beef stock cubes

just boiled water

large potatoes (peeled and chopped (about 300g each))

Worcestershire sauce

salt

pepper

egg (lightly whisked)

x320g packs of ready-rolled shortcrust pastry