Poireaux Vinaigrette
(pwah-ro vee-nay-gret)
Chapter 1 — Apéro & Hors d'Œuvres
At institutions like Pastis, this humble root—long dismissed as the poor man's asparagus—is transformed into a silken, deeply savory appetizer through nothing but rigorous professional technique. There is no magic ingredient here. The secret is the brutal prep schedule of a working brigade: an aggressive boil in a seasoned court-bouillon, a violent plunge into ice to lock in that emerald green, and a merciless pressing to extract every drop of water. Held overnight to firm up and served strictly at room temperature under a sharp Dijon emulsion, this is exactly what Spring Street tastes like. Do not serve it cold from the fridge, or you'll mask every bit of the leek's latent sweetness.
Before you start
Plan for the overnight chill.
The leeks must be boiled, pressed, and chilled overnight to achieve the proper meaty texture of a true brasserie appetizer. Rushing this dish on a weeknight will result in a mushy, watery plate that refuses to hold the vinaigrette.
Ingredients
- slender leeks12 small
- water1 gal
- Kosher salt1/2 cup
- dry white wine1/2 cup
- bay leaves2 med
- whole black peppercorns1 tsp
- shallot1 large
- Champagne vinegar3 tbsp
- Dijon mustard1 tbsp
- grapeseed or canola oil1/4 cup
- extra-virgin olive oil1/4 cup
- fleur de sel1/2 tsp
- black pepper1/4 tsp
- eggs2 large
- slivered almonds1/3 cup
- mixed soft herbs1/4 cup
Method
- 01
Clean and bundle the leeks.
Submerge the slit leeks in cold water, swishing vigorously to dislodge trapped sand, then tie them into bundles of four with kitchen twine so they don't thrash and disintegrate in the pot.
- 02
Boil the court-bouillon and prepare an ice bath.
Bring the water, wine, Kosher salt, bay leaves, and peppercorns to a rolling, aggressive boil in a large Dutch oven; do not skimp on the salt, as the water must taste like the sea to properly season the leeks to their core.
- 03
Blanch until completely yielding.
Submerge the leek bundles, weighing them down with a heavy plate if they float, and boil steadily for 15 to 25 minutes until a paring knife meets absolutely zero resistance at the thickest part of the root.
- 04
Shock the leeks to halt the cooking process.
Using tongs, immediately drag the bundles from the boiling water and plunge them into the ice bath for three minutes to stop enzymatic breakdown and lock in that vibrant emerald hue.
- 05
Extract the water and hold overnight.
Snip the twine, lay the leeks flat between two clean kitchen towels, and press down firmly with your hands to expel excess water—a waterlogged leek will instantly dilute your vinaigrette. Cover tightly and refrigerate overnight to firm their cellular structure.
- 06
Boil and sieve the eggs for the mimosa.
Simmer the eggs for exactly 9 minutes, shock in ice water, and peel. Finely chop the whites, then use the back of a spoon to push the yolks through a fine-mesh sieve, creating light, fluffy yellow crumbles.
- 07
Build the brasserie emulsion.
Macerate the shallot in the vinegar and fleur de sel for ten minutes to kill the raw bite, then whisk in the Dijon. Anchor your bowl with a damp towel and stream in the neutral and olive oils, drop by drop at first, whisking aggressively until the vinaigrette is thick and creamy.
- 08
Bring to room temperature and assemble.
Remove the leeks from the fridge at least an hour before serving so the fats don't congeal against cold flesh. Slice them into batons, arrange on a platter, drown generously in the vinaigrette, and blanket with the egg whites, mimosa yolks, toasted almonds, and fresh herbs.
Notes
The Emulsion Rescue.
If your vinaigrette breaks and separates because the oil went in too fast, place a teaspoon of Dijon mustard and a splash of hot water in a clean bowl. Whisk them together, then slowly stream your broken dressing into this new base to magically re-form the emulsion.
Respect the Oil Blend.
Do not use 100% extra-virgin olive oil. The aggressive mechanical shearing of whisking will turn its polyphenols intensely bitter, and heavy olive oil masks the delicate allium sweetness of the leek. A 50/50 split with a neutral oil like grapeseed or canola is non-negotiable for true bistro flavor.