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Arrange the leeks in a wide, lidded pan, so they’re no more than 2 leeks deep at any point, then pour over enough boiling water to cover. Cover the pan and cook for 4-6 mins until just tender. Drain, refresh in cold water, then drain again. Now set aside until you are ready to serve.
Whizz the nuts in a food processor until finely chopped but not powdery, or chop by hand. Mix with the oil, citrus juices and vinegar. Season well.
To serve, heat a griddle or frying pan and toss the leeks in some oil. Griddle batches for 1 min on each side until slightly charred and warmed through, then put onto 4 plates. Stir the parsley into the nutty dressing, spoon over and serve.