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Cook the rice following pack instructions. Meanwhile, heat the curry paste with a splash of water in a frying pan with a lid. Add the onion and gently cook until soft. Pour in the coconut milk and crumble on the stock cube. Simmer to make a smooth sauce, adding a splash of water if it’s too thick.
Stir in the beans, then top with the fish. Cover and simmer for 10-12 mins until the fish is just cooked through. Drain the rice, halve it, letting the other half cool for tomorrow – chill once cool. Sprinkle the curry with the spring onions and serve with the rice.