Defrost pastry for 15 minutes Preheat oven to 200 degrees celsius Heat oil in a large frypan and saute potato and onion for 4 minutes until almost tender. Add beef mince and cook for 2 minutes, breaking it up, until it is no longer pink. Drain off the fat and return to heat. Stir in spices, cook 1 minute Stir in peas and chicken stock, cook until almost dry and potatoes are tender.remove from heat, and let cool slightly. Unroll a pie crust on cutting board. Cut into 4 equal wedges if using a square,such as filo, cut into 4 squares .. Moisten edges of 1 wedge with water. Place 1/3 cup filling onto half of wedge, leaving about a 1/2-in. border on two sides. Fold in half to make a triangle, pressing edges to seal in filling. Transfer to baking sheet. Repeat with remaining crust and filling. Brush lightly with egg. Bake 15 to 20 minutes until golden.