1 red chilli, seeded and roughly chopped
1 bunch fresh coriander, stalks and leaves separated
2 garlic cloves, peeled and crushed
1 thumb-sized piece fresh root ginger, peeled and finely grated
1 onion, roughly chopped
3 dried bay leaves
5 cardamom pods, lightly crushed
5cm/2in cinnamon stick
4 cloves
2 tsp coriander seeds, toasted and ground
2 tsp cumin seeds, toasted and ground
2 tsp garam masala
2 tsp paprika
1 tsp black peppercorns, roughly ground
pinch salt
2 tbsp tomato purΓ©e
1 tsp turmeric
100g/3Β½oz fat-free natural yoghurt
600g/1lb 5oz lamb neck fillet, all visible fat removed, cut into 3cm/1in chunks