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Mix the sugar, butter, flour, eggs, lemon zest and vanilla together until creamy, then spoon into a medium microwave-proof baking dish. Microwave on High for 3 mins, turning halfway through cooking, until risen and set all the way through. Leave to stand for 1 min.
Meanwhile, heat the lemon curd for 30 secs in the microwave and stir until smooth. Pour all over the top of the pudding and serve with a dollop of crème fraîche or scoops of ice cream.