Prepare Aloo Ki Sabji: In a kadai, heat mustard oil until smoky hot, then add bay leaf, cumin seeds, fenugreek seeds, fennel seeds, green chillies, and ginger. Let it splutter for a minute. Add potatoes, salt, a little water, and cook for 10-12 minutes until well cooked. Finish with prepared masala, dry mango powder, and fresh coriander leaves.
Prepare Masala: Dry roast black peppercorns, cumin seeds, black cardamom, cloves, coriander seeds, green cardamom, salt, and cinnamon stick. Grind into a fine powder.
Fry Chillies: Heat mustard oil until smoky, add green chillies, and fry until light golden. Mash well and set aside.
Prepare Raita: Mix mashed chillies, curd, salt, and crushed black peppercorns. Garnish with degi red chili powder, crushed black peppercorns, and fried chilli.
Prepare Mirch Ki Puri: Divide dough into medium lemon-sized balls, flatten with a rolling pin, add a pinch of degi red chilli powder, and fry in hot oil until golden.
Serve: Serve the aloo ki sabji hot with mirch ki puri and prepared raita.