Classic Vinaigrette

Mince the shallot as finely as you can, then stir it into the vinegar with the salt. Let it sit for 10 minutes (or up to an hour). The acid softens the shallot's raw bite, draws out its sweetness, and dissolves the salt completely so there is no grit left to scratch through the finished dressing. Crucially, salt only dissolves in the water-based vinegar — never in oil — so it must go in now, before any fat enters the bowl.

Whisk the Dijon (and honey, if using) into the seasoned vinegar until it is uniform and a touch foamy. The mustard is doing real work here, not just flavoring: its mucilage and lecithin act as the emulsifier that will keep the oil suspended. A vinaigrette built on mustard holds together for hours instead of splitting in seconds.

Whisking constantly and hard, add the olive oil in the thinnest possible thread to start — almost drop by drop. Each addition must be fully absorbed and the mixture thickened before you add more. Once it visibly turns creamy and pale, you can pour the oil in a slow steady stream. The mustard and shallot break the oil into microscopic droplets and trap them in the vinegar; rush it and the droplets coalesce, and the whole thing slips back to oil floating on vinegar.

Grind in the black pepper and taste on a leaf of lettuce, not a spoon — fat coats the tongue and mutes seasoning, so a vinaigrette always tastes blander on greens than off the whisk. Adjust: a pinch more salt if flat, a splash of vinegar if dull, a thread more oil if too sharp. Dress greens only at the last second and use less than you think; a properly emulsified vinaigrette clings, so a little coats a lot.