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Heat the butter in a saucepan, add the coriander, if using, and cook for 1 min. Stir in the lentils and carrots, then pour in enough water to just cover.
Bring to the boil, cook for 10 mins, then turn down and simmer for a further 5 mins or until the lentils and carrots are tender.
Drain, then transfer to a food processor and pulse until smooth with the yogurt, if needed. Serve one portion and divide the rest between small containers and freeze.