Emulsions
Dijon Vinaigrette
Vinaigrette à la moutarde de Dijon · A stable emulsion of oil in acid, built on a 3:1 ratio and rendered permanently emulsified by the natural lecithins and mucilage in Dijon mustard. Unlike a simple vinaigrette that separates in minutes, a Dijon vinaigrette holds for service. It is the workhorse cold sauce of the French repertoire, a universal dressing, marinade and finishing sauce.
The formula
3 parts oil : 1 part acid (by volume)
The acid phase includes vinegar and any added liquid (e.g., water, verjuice, or citrus juice). Mustard is not counted in the ratio — it is the emulsifier and is used to taste, typically 1–2 tsp per 60 ml total dressing.
Identity
- 3:1 oil-to-acid volume ratio — the non-negotiable foundation of balance
- Dijon mustard as the sole emulsifier — provides permanent suspension without egg
- Properly built emulsion: oil droplets fully coated and distributed, no visible separation
- Acid must be real wine vinegar or citrus — not bottled 'salad dressing'
- Seasoned with salt, pepper, and optionally a touch of honey or shallot
Ingredients
| Binder | Dijon mustard (whole-grain or smooth, original) | The emulsifier. Smooth is standard for a clean base; grain adds texture. Both work identically as emulsifiers. |
| Acid | Wine vinegar (red or white) or fresh lemon juice | Red wine vinegar is classic; white wine vinegar is more neutral; lemon adds brightness but no aroma. |
| Fat | Extra-virgin olive oil or neutral oil (grapeseed, sunflower) | Olive oil for full-flavored dressings; neutral oil for a cleaner, more universal profile. Never use cold-pressed oils at high temperature. |
| Liquid | Water or verjuice (optional, small amount) | Thins the emulsion slightly and adds a touch of acidity without overwhelming. Optional but traditional in some French kitchens. |
| Seasoning | Fine sea salt | Dissolves into the acid phase before oil is added; essential for proper seasoning and initial emulsification. |
| Seasoning | Freshly ground black pepper | Added after emulsification is complete to preserve volatile aromatics. |
| Aromatics | Shallot, fine mince (optional) | Macerated in vinegar for 10 minutes before building the emulsion; adds savor and a subtle sweetness. |
| Flavor | Honey or Dijon syrup (optional) | A pinch (½ tsp per 60 ml) rounds sharp acidity. Not traditional in classical French cooking but widely used. |
Method
- 1Combine mustard, salt, and vinegar (and shallot if using) in a non-reactive bowl. Whisk until salt dissolves.Salt must dissolve in the acid phase before fat is introduced — it begins the emulsification process by coating the mustard particles and creating an initial aqueous phase.
- 2Add the oil in a very thin, steady stream while whisking briskly and continuously with a fork or small balloon whisk.Slow incorporation allows each oil droplet to be immediately coated by the emulsifiers in the mustard-vinegar phase before it can coalesce with other droplets. Rushing causes immediate separation.
- 3Continue whisking until the emulsion is glossy, uniform, and holds its structure. It should coat a spoon.A fully formed emulsion has overcome the interfacial tension between oil and water — the mustard's lecithins and hemicelluloses form a continuous protective film around every droplet.
- 4Season with pepper, adjust acid with a few drops of vinegar or lemon, adjust richness with a pinch of salt. Add a tiny amount of water if the texture is too thick.Seasoning after emulsification prevents over-correction. Water thins the continuous phase without breaking the emulsion, unlike adding more oil which requires re-whisking.
- 5Rest for 5 minutes before using, or cover and refrigerate for up to 2 weeks.A brief rest allows the mustard's glucosinolates and vinegar to fully integrate, mellowing harsh edges. Refrigeration slows oxidation and microbial growth.
Techniques that matter
Emulsification (oil-in-water)
The core technique: permanently suspending fat droplets in an aqueous medium using an amphiphilic emulsifier (mustard). Without an emulsifier, oil and vinegar separate within seconds.
Ratio-based construction
The 3:1 ratio is the structural constant. All flavor adjustments (acid type, oil type, aromatics) are made within and around this framework.
Whisk speed and incorporation rate
The speed of oil addition and whisking intensity directly determine droplet size and therefore emulsion stability. Slow and steady produces small droplets and a stable, thick dressing.
Variations & derivatives
Shallot VinaigretteFrance (Burgundy / classic bistro)
Shallot is macerated in vinegar for 10 minutes before the emulsion is built. Adds savor and a gentle sweetness; standard in most fine-dining salad preparations.
Vinaigrette au MielFrance / contemporary
Honey is whisked into the acid phase before oil. Softens the acid, rounds the finish. Common in modern French and American brasserie cooking.
Green Goddess VinaigretteUnited States (California, 1970s)
Dijon vinaigrette blended with tarragon, chervil, parsley, chives, and anchovy. The vinaigrette is the structural base; herbs and umami are additions.
Beurre Blanc Vinaigrette (light)France (Loire cuisine)
A vinaigrette built with a small amount of cold whisked butter at the end — a hybrid technique bridging emulsified sauce and dressing.
RavigoteFrance (classical)
A vinaigrette with added chopped cornichons, capers, herbs (tarragon, chives, parsley), and sometimes anchovy. Served warm or cold with cold meats and boiled eggs.
Used in these dishes
Substitutions
- Dijon mustard → Whole-grain Dijon or coarse-ground mustard — Grain mustard works identically as an emulsifier; the texture changes but the emulsification is equally effective.
- Red wine vinegar → White wine vinegar or fresh lemon juice — Both are true wine acids. Lemon adds brightness but lacks the subtle fruity depth of red wine vinegar.
- Extra-virgin olive oil → Grapeseed or sunflower oil — Neutral oil produces a cleaner, more universally applicable dressing. The flavor profile changes entirely but the emulsion is equally stable.
- Dijon mustard → Mayonnaise (1–2 tbsp) — Mayonnaise is itself an emulsified sauce using egg yolk as the emulsifier; it can stabilize a vinaigrette but changes the flavor profile significantly.changes result
- Wine vinegar → Rice vinegar — Rice vinegar is lower in acidity (4% vs 6–7%) and slightly sweet; use slightly more to achieve equivalent sourness. Not a 1:1 substitution.changes result
Troubleshooting
Dressing separates (breaks) within minutes
Oil added too quickly or insufficient whisking — oil droplets coalesce before the emulsifier coats them. May also occur if mustard is expired (lost emulsifying power). → Start over: place 1 tsp fresh Dijon mustard in a clean bowl, add 1 tbsp vinegar, whisk, then slowly whisk in the broken dressing as if it were fresh oil. This re‑emulsifies the existing dressing.
Dressing tastes harsh or too acidic
Acid overpowering the oil — ratio is correct but vinegar type is too sharp, or dressing was not tasted and adjusted after emulsification. → Add a pinch of salt and a tiny pinch of honey or sugar. Whisk in well. Alternatively, whisk in a few drops of water or a teaspoon of neutral oil to dilute the acid perception.
Dressing is too thick or gloppy
Too much mustard relative to the total volume, or oil was added too slowly causing excessive viscosity from over‑emulsification. → Add vinegar or water a teaspoon at a time, whisking, to thin. The emulsion is robust and will accept dilution without breaking.
Dressing tastes flat or one‑dimensional
Salt not dissolved before oil added, or pepper and aromatics omitted. Underseasoned acid phase produces a flat emulsion. → Season the acid‑mustard phase before adding any oil. Taste and correct seasoning after the emulsion is formed — this is standard and expected.