thumb-sizedpiece ginger, peeled and roughly chopped
1tbsp vegetable oil
1heaped tsp turmeric
2heaped tsp ground cumin
2heaped tsp ground coriander
1tsp mild chilli powder
2tbsp tomato purée
800gtrimmed lamb shoulder, cubed
400gcan coconut milk (save 2 tbsp for serving)
1ripe mangoes, sliced
rice,chutneys and pickle of your choice
Heat oven to 160C/140C fan/gas 3. Put the onions, ginger and garlic in a food processor and blitz to a paste. If you don’t have a processor, just chop very finely. Heat the oil in a deep flameproof casserole dish and fry the paste for 10 mins. Add some salt, the spices and tomato purée, then fry for 2-3 mins more until aromatic.
Stir in the lamb and cook for a few mins until it changes colour all over – it doesn’t need to brown. Tip in the coconut milk, tomatoes and 100ml water, and bring to a simmer. Cover with a lid, leaving a gap for some steam to escape, and transfer to the oven for 1½ hrs.
Stir in half the mangoes, and cook for 1 hr more until the lamb is melting and tender. When it’s ready, let the curry sit for 10 mins, then spoon off any excess fat from the top. Partly stir in the remaining mangoes, scatter with the coriander and drizzle with the reserved coconut milk. Serve with rice, chutneys and pickles of your choice.