Iconic Parisian bistro classic: whole tender young leeks gently steamed until meltingly soft, dressed at room temperature with a classic sharp French Dijon vinaigrette, chopped hard-boiled egg, and chives.
Tie leeks in bundles with kitchen twine. Steam over boiling salted water for 12-15 minutes until completely tender when pierced with a knife.
Drain leeks thoroughly on clean towels, pressing gently to remove excess water. Let cool to room temperature.
Whisk Dijon mustard, minced shallot, vinegar, salt, and pepper in a bowl. Slowly whisk in olive oil until emulsified.
Untie leeks and arrange side-by-side on a serving platter. Spoon vinaigrette generously over leeks, scatter chopped hard-boiled eggs and chives on top.