In a pan heat some oil and add the cumin seeds, once fragrant stir in the chunky onions and peppers, tomato and the chilli then stir fry. Set aside.
Heat oil in a pan, add the cumin seeds, chilli and garlic and fry until lightly browned.
Add the chopped tomatoes, salt and turmeric then cook so the tomatoes break down to make a lovely thick gravy.
Add the lamb and stir to coat the pieces. Reduce the heat and place the lid on the pan and leave to cook for 20-30 minutes on a low heat until it is soft and tender.
Once the lamb is cooked and the sauce has reduced stir in the garam masala fried vegetable mix.