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Heat a deep frying pan or flameproof casserole dish and add 2 tsp of the oil. Brown the chicken breasts quickly but well on both sides, then remove to a plate. Turn down the heat and add the remaining oil, the onions, ginger and garlic. Fry gently until soft. Add the spices and cook for a few mins, stirring.
Stir in the vinegar, sugar, tomatoes and coconut milk. Bring to a simmer and bubble for 10 mins. Roughly chop the chicken breasts and stir into the pan with any chicken juices and the peppers. Simmer for another 20 mins until the chicken is cooked through and the sauce reduced a little. Take off the heat, stir in the coriander leaves and season to taste – it will need a good seasoning.
To make the topping, put the potatoes in a big pan of water, bring to the boil, then boil until cooked – 10-15 mins depending on how big your chunks are. Drain really well, then tip back into the pan and steam-dry for a few mins.
Add the coconut milk and turmeric to the pan, and mash really well. Season with the lemon juice and some salt, then stir through the spring onions and coriander stalks.
Spoon the chicken masala into a baking dish. Dollop on spoonfuls of mash to cover, then sprinkle over the kalonji seeds. Can be covered and chilled for up to 2 days (or frozen for up to a month).
Heat oven to 200C/180C fan/gas 6 and bake for 25-30 mins (or 45 mins from chilled) until hot through and crisping on top. Serve with naan bread, if you like.
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