In a large pan with a lid heat the oil (medium heat) and add in the cumin seeds.
Add the chopped onions and fry over a medium heat for a few minutes until golden.
Blend together the garlic, ginger, chilli powder, turmeric, ground coriander and cumin, curry powder and salt. When the onions are ready add this mixture to the onions and stir fry for about 2 minutes.
Add the lamb to the mixture and stir fry for about 7-10 minutes, breaking up any lumps of meat that may form.
Finally, add the carrots, peas, potatoes and coriander leaves to the pan, stir and cover until the potatoes are cooked and the mixture is thick (it shouldn't be runny).