Poireaux vinaigrette is one of the plainest and most beloved cold entrées of the French bistro: whole leeks poached until silky, drained, pressed of their water and served cool under a sharp mustard vinaigrette, often with chopped hard-boiled egg or shallot scattered over. Cheap, green and faintly sweet, it is the archetypal entrée froide of the prix-fixe lunch — the dish that, with a glass of red and a steak to follow, defines the modest bistro. It is eaten across the country with no single regional home.
The dish belongs to the everyday repertoire of French home and bistro cooking rather than to grande cuisine, and no inventor or town is recorded for it. Leeks — the poireau, long a staple of the cottage potager and cheap at market — have been eaten cold in a vinaigrette since at least the 19th century, when the dressing of oil, vinegar and mustard was already standard French table sauce. It became a fixture of the working-class menu du jour because it was inexpensive, could be prepared in advance and held well cold. It is sometimes nicknamed asperges du pauvre, 'the poor man's asparagus', the leek standing in for the costlier spring vegetable it loosely resembles when trimmed to its white.
The leeks arrive cool and limp, a deep yellow-green, glistening with dressing. The texture is the point: poached right, they are meltingly soft, almost slippery, with none of the squeak of raw allium — just a mild, sweet onion flavour. The vinaigrette cuts straight through that sweetness with mustard heat and vinegar sharpness, and the egg or shallot on top adds a little texture. Eaten with bread to mop the dressing, it is light, clean and quietly satisfying. Watery leeks that weren't pressed will dilute the dressing into a puddle.
Poaching is what makes the dish: held in barely-simmering salted water, the leek's tough cellulose and the pungent sulphur compounds of the raw allium soften and mellow, the texture turning from fibrous to tender. Over-boiling, though, waterlogs and frays the layers, so the leek is cooked only until a knife slides in, then plunged into cold water to stop it and set the colour. Pressing the drained leek — between plates or in a towel — is essential: leeks trap water between their sheaths, and that water, if left, bleeds out on the plate and breaks the vinaigrette. The dressing itself is a loose emulsion of oil into vinegar held briefly by the mustard.
Variations
The dressing varies by cook: some keep it a plain Dijon vinaigrette, others fold in chopped shallot, capers, parsley or tarragon, or finish with sieved hard-boiled egg in the style called mimosa. A richer version dresses the warm leeks in a mustardy ravigote. The same cold treatment is given to asparagus and to cooked green beans. It is a close cousin of the bistro plate of céleri rémoulade and carottes râpées, the three often served together as crudités or assiette de hors-d'œuvre.
On the Palate
Where Poireaux Vinaigrette sits in the French flavor cloud
Ingredients
Serves 4How it's made
6 steps · 15 min active + 20 min waiting
- 18 min
Trim the leeks, removing roots and tough green tops; split lengthwise if thick and wash out all grit between the layers.
- 215 min
Poach the leeks in salted barely-simmering water until a knife slides in easily, about 12 to 18 minutes.
Watch outPoach only until a knife tip slides through with no resistance — boil it hard and the layers waterlog and fray.
- 33 min
Lift out and plunge into cold water to stop the cooking and keep the colour, then drain.
- 45 min
Press the leeks gently between two plates or in a clean towel to squeeze out trapped water.
Watch outPress until no more water beads out; that trapped water is what bleeds onto the plate and breaks the vinaigrette.
- 53 min
Whisk a vinaigrette of Dijon mustard, vinegar, oil, salt and pepper until lightly emulsified.
- 62 min
Arrange the cool leeks on a plate, spoon the vinaigrette over, and scatter with chopped hard-boiled egg or shallot.
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