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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 sweet potatoes, then pour in enough water to just cover.
Bring to the boil, then cover and simmer for 15 mins or until the lentils and sweet potatoes are tender.
Drain, then mash together. Stir through the yogurt, if using.