1. Begin by pre-heating a small frying pan over a medium heat, then add the coriander and cumin seeds and dry-roast them for about 2-3 minutes, moving them around the pan until they change colour and begin to dance. This will draw out their full spicy flavour. Now crush them quite finely with a pestle and mortar.

2. Next, heat 1 tablespoon of the oil in a large (6 pint/3.5 litre) saucepan and gently cook the onion until soft and lightly browned, for about 5 or 6 minutes, then add the crushed garlic and sea salt and let that cook for another 2 minutes. After that, add the crushed seeds, the allspice and chilli powder and stir them into the juices in the pan. Now transfer all of this to a plate and keep it aside while you heat the other tablespoon of oil in the same pan until it's very hot. Then add the pieces of lamb and brown them, quickly turning them over and keeping them on the move.

3. Turn the heat down and now return the onion and spice mixture to the pan to join the meat, adding the tomato pur.