https://www.bbc.co.uk/food/recipes/lamb_rogan_josh_04376
For the rogan josh paste:
- 50g fresh coriander, stalks and leaves separated
- 2 red chilli, seeded and roughly chopped
- 4 tsp coriander seeds, toasted and ground
- 4 tsp cumin seeds, toasted and ground
- 2 tsp black peppercorns, roughly ground
- 4 tsp paprika
- 2 tsp turmeric
- 4 tsp garam masala
- 1 tsp salt
- 2 tbsp tomato purée
For the lamb:
- 1kg lamb neck fillet, all visible fat removed, cut into 3cm/1in chunks
- 2 onions, roughly chopped
- 1 tbsp groundnut oil
- 2 5cm cinnamon stick
- 10 cardamom pods, lightly crushed
- 5 dried bay leaves
- 8 cloves
- 30g garlic peeled and crushed
- 30g fresh root ginger, peeled and finely grated
- 200g yoghurt
For the the paste:
- blend together the coriander stalks, red chilli, ground spices and salt.
- Mix in the tomato purée.
For the Lamb:
- heat the oil in a large heavy-based casserole.
- Fry the cinnamon stick, cardamom pods, bay leaves and cloves for 2 minutes.
- Add the onion and lamb and fry for 4-5 minutes, stirring.
- Add the garlic and ginger and fry for 2 minutes.
Finish:
- Add the spice paste and fry for another 2 minutes, stirring
- Cover with a lid and simmer for 40-50 minutes, until cooked.
- Stir in the yoghurt and cook for 10 minutes.
- Serve garnished with the fresh coriander leaves.