Instructions

  1. Steam leeks over a saucepan of boiling water until they are just tender.
  2. Meanwhile, in a bowl, stir together mustard & vinegar.
  3. Cut egg in half lengthwise & scoop egg yolk into the bowl & mash it thoroughly into the mustard mixture, using a fork.
  4. Gradually work in the oil to make a smooth sauce, then season to taste with salt & pepper.
  5. Life leeks out of steamer & place on several layers of paper towels, then cover them with more paper towels & pat dry.
  6. Transfer leeks to serving dish while still warm.
  7. Spoon dressing over them & let cool.
  8. Finely chop egg white using a large sharp knife, then mix with chopped fresh parsley & scatter over the leeks.
  9. Chill in refrigerator until ready to serve.