STEP 1
Heat 2 tablespoons of oil in a pan over medium heat. Add the cumin seeds and let them sizzle for about 30 seconds. Then, add the finely chopped onions, garlic, and ginger, sautéing until the onions are soft and golden, about 5-7 minutes.
STEP 2
Add the minced beef, stirring well to break it up. Cook until the beef is browned, around 7-10 minutes. Stir in the curry powder, turmeric, chilli powder (if using), ground coriander, and salt. Cook the spices for about 2 minutes to release their flavours.
STEP 3
Add the chopped tomatoes and green chillies, cooking until the tomatoes soften, about 5 minutes. Pour in the water or beef broth, bringing the mixture to a simmer. Let it cook for 5-7 minutes until the mixture thickens. If you're using peas, add them now. Once done, garnish with chopped coriander and set aside to cool.
STEP 4
Preheat the air fryer to 180°C (360°F). Roll out the shortcrust pastry and use it to line the base and sides of a pie dish, trimming any excess. Fill the pastry with the cooled minced beef mixture, spreading it evenly.
STEP 5
Roll out the puff pastry for the top layer of the pie. Cover the filling with the puff pastry, trim the edges, and press the sides to seal the pie. Brush the top with the beaten egg. Place the pie in the air fryer and cook at 180°C (360°F) for about 25 minutes, or until the pastry is golden and crispy.
STEP 6
In a bowl, mix together the yoghurt, finely diced cucumber, ground cumin, ground coriander, chaat masala (if using), salt, black pepper, sugar, and lemon juice. Stir in the finely chopped mint and coriander leaves. Taste and adjust seasoning if needed. Refrigerate until ready to serve.