Juice the lemon into a large bowl, then tip in the yogurt, tomato purée, oil, garlic & ginger purée and spices. Season with 1 tsp fine sea salt and some black pepper, then add the lamb chops and mix with your hands to coat. Chill for at least 1 hr, or for best results, overnight – the yogurt will help tenderise the lamb, so the longer, the better.
