Heat the oven to 200 degrees Celsius (392 degrees Fahrenheit)
Heat the oil in a frying pan and cook the onion until softened. Add the tomato puree and stir well. Then add the minced meat, pepper, salt and nutmeg, cumin and masala. Stir well and cook until the minced meat is browned and crumbly.
Take the pan off the heat and add the pickles, peas, carrot, capers, egg and celery. Season with salt and pepper and mix well. Let it cool a bit.
Fill every sheet of puff pastry with some of the filling (approximately 2 tbsp). Brush the edges with a bit of the beaten egg and fold the puff pastry into a triangle. Seal the edges well with a fork.
Brush the triangles with the beaten egg and bake them in the pre-heated oven for about 8 minutes until golden brown. Enjoy!
