Cut out 6 x 12cm rounds of pastry and 6 x 8.5cm rounds of pastry and and return to the fridge.
Heat oil in a large fry pan over medium heat.
Add onion, carrot, celery and potato and fry stirring for 5 minutes.
Add curry leaves, curry powder and cumin seeds and stir for a further 5 minutes.
Turn off heat and add beans, coriander and egg. Stir through and season.
Take out 2 large rounds of pastry at a time.
Pile a mound of potato mix in the centre of each pastry round.
Pinch the sides in at four spacings to create a square shape, then repeat again so you are left with a rounder shape. Top up the pie if you wish with a little more filling.
Cover the top with your smaller round of pastry and pop two thin knife marks in it to release steam.
Brush pastry with a little milk.
Place all pies on a lined baking tray and bake for 25 minutes or until pastry is browned and filling hot.