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Heat the coconut oil in a casserole or wok over a medium heat and add the onions, dried chillies, ginger, garlic, curry leaf and mustard seeds, fry for 12-15 mins until the onion is soft, then stir in the tomato purée, chilli and turmeric and continue to cook for 1-2 mins more. Pour in the coconut milk and 200ml water, simmer the sauce for 20 mins, then blitz in a blender or with a hand blender until smooth.
Pour the sauce back into the saucepan and bring up to a simmer. Stir in the cauliflower and potato, cover and simmer for 15 mins. Add the prawns and poach for 2 mins, or until they turn pink. If freezing, cool and freeze, then defrost and reheat when you’re ready to eat. To serve, scatter the spring onions, coriander and peanuts over the curry and squeeze over a little lime juice.
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