
A rich and aromatic North Indian classic featuring tender lamb slow-cooked in a thick, intensely flavored tomato and onion sauce. This 'bhuna' style curry is famous for its deep, caramelized flavors and satisfyingly thick consistency, making it a perfect weekend treat.
Prepare the marinade by mixing the finely grated garlic, ginger, malt vinegar, ground cinnamon, and 1 tablespoon of sunflower oil with a generous pinch of salt in a large bowl. Add the lamb chunks and toss thoroughly to coat. Cover and marinate for at least 1 hour at room temperature, or for the best flavor, refrigerate overnight.
In a large flameproof casserole dish or heavy-based pan, heat the remaining 3 tablespoons of sunflower oil over medium heat. Add the finely chopped onions and fry for about 10 minutes, stirring frequently until they are soft and deep golden brown. If the pan looks dry, add a tiny splash more oil.
Stir in the curry leaves and dried chillies (or chilli flakes) and fry for 2 minutes. Add the cumin seeds, mustard seeds, ground coriander, and fenugreek. Cook for another 5 minutes, allowing the spices to toast and the onions to begin caramelizing.
Increase the heat to high and add the marinated lamb. Cook for 5 minutes, stirring constantly until the meat is browned on all sides. Stir in the tomato purée and cook for 1 minute, then add the canned chopped tomatoes and 100ml of water.
Bring the mixture to a gentle simmer, then reduce the heat to low. Cover the pan and cook for 1 hour and 20 minutes, stirring occasionally to prevent sticking, until the lamb is meltingly tender.
Remove the lid and increase the heat slightly. Cook for a final 8-10 minutes until the sauce has reduced to a thick, dark consistency that clings to the meat. Remove from the heat, stir in the garam masala, and adjust the seasoning with salt to taste.
For the most authentic flavor, use lamb shoulder as it has enough fat to stay juicy during the long simmer. If you prefer a spicier curry, lightly crush the dried chillies before adding them. This dish freezes beautifully for up to two months and the flavors actually improve if made a day in advance.