Preheat the oven to 180 degrees Celsius.
Heat a tablespoon of oil in a pan over medium heat. Add the diced onion and spices (curry powder, cumin, mustard seeds), and sauté until fragrant and the onion is translucent.
Add the pork mince to the pan, cook until browned, and break it up with a wooden spoon – season with salt and pepper to taste.
Stir in the cooked diced potatoes and peas. Cook for another 2-3 minutes, then add the chutney. Reduce heat and let the filling cool for about 10 minutes.
Cut each pastry sheet into 4 equal squares (you should have 8 squares total). Place 2-3 tablespoons of the filling in the centre of each square.
Brush the edges of the pastry with beaten egg, then fold over to form triangles or rectangles. Seal the edges by pressing with a fork.
Transfer the pies to a lined baking tray. Brush the tops with beaten egg and sprinkle with sesame seeds.
Bake for 25-30 minutes until the pastry is puffed and golden brown. Allow to cool slightly before serving.
