Oil and vinegar: Vinaigrette & Dressings
The most discarded sauce in restaurants is not the hollandaise or the bearnaise. It is the vinaigrette that has been sitting in a squeeze bottle for two weeks and tastes like petroleum. I know kitchens where the vinaigrette gets topped up instead of replaced, week after week, until all that remains is a palimpsest of vinegar and stale olive oil. Vinaigrette is simple. But simple does not mean it turns out well on its own. This is the emulsion chemistry, the ratios and the variants.
In brief
A vinaigrette is a temporary or stable oil-in-water emulsion of vegetable oil and acid (vinegar or citrus juice), finished with salt and optionally mustard as an emulsifier. Without an emulsifier, the sauce separates within minutes. With mustard as an emulsifier, the sauce remains stable for 15-30 minutes. With an egg yolk as emulsifier (Caesar-style), the sauce is stable for days but is technically a mayonnaise hybrid.
- Unstable emulsion without mustard: oil and water (vinegar) are immiscible: they do not mix by nature. Mechanical shaking (in a bottle or with a whisk) disperses the oil into small droplets that are temporarily surrounded by the water phase. Without an emulsifier, there are no molecular boundaries around the oil droplets and the sauce separates after 5-10 minutes. This is the nature of an unstable emulsion. (McGee, On Food and Cooking, Scribner 2004, p.632)
- Mustard as emulsifier: the mucilage in Dijon mustard surrounds the oil droplets and forms a semi-stable boundary layer. This extends the stability of the emulsion from minutes to 15-30 minutes at room temperature. A vinaigrette with mustard should still be stirred just before use but does not need to be re-emulsified every time. (CIA Professional Chef, 9th ed., Wiley 2011, Ch.25)
- Vinegar type determines the flavor profile: white wine vinegar gives a delicate, fresh acidity. Red wine vinegar is bolder with more tannin. Balsamic is sweeter and more syrupy: use a maximum of 50% balsamic in the ratio, otherwise the sweetness overpowers. Sherry vinegar is earthy and complex. Rice vinegar is mild and Asian in character. (Larousse Gastronomique, Editions Larousse 2009, p.1186)
- Oil type determines the body: extra virgin olive oil has an intense fruity character and is dominant at a 3:1 ratio. For salads where the ingredients should speak for themselves: use a milder oil (grapeseed oil, peanut oil) and a maximum of 30-40% EVOO. Pure EVOO in a classic vinaigrette overpowers delicate lettuce varieties. (CIA Professional Chef 2011, Ch.25)
- Dissolve salt in the acid phase: salt does not dissolve in oil but does dissolve in water and vinegar. Always dissolve the salt in the vinegar before adding the oil. A vinaigrette with undissolved salt leaves gritty salt crystals on the salad instead of evenly seasoned leaves. (McGee 2004, p.632)
Six classic vinaigrettes and dressings
Classique Francaise
White wine vinegar + Dijon mustard + salt + olive oil. Ratio 3:1. Optional: finely diced shallot, fresh thyme or chervil. The base vinaigrette of classic French cuisine. Escoffier describes it in recipe #154 as the only dressing for a salade verte. (Escoffier 1903, recipe #154)
Examples: Salade verte, frisee, endive, poultry salad
Balsamic Vinaigrette
Aceto balsamico tradizionale (or commercial): max 30-40% of the acid component, supplemented with white wine vinegar. Oil-to-vinegar ratio 3:1. Richer and sweeter than classique. Classic with grilled vegetables, Caprese and arugula. Note: cheap balsamic made from caramel and vinegar gives a sweet-sour taste without the complexity of real balsamic.
Examples: Caprese, arugula + Parmesan, grilled vegetables
Citrus Vinaigrette
Fresh lemon juice or orange juice as the acid component instead of vinegar. Less stable than the vinegar version (more water, less acid). Ratio: 2.5:1 oil-to-citrus juice. Brighter in flavor, shorter shelf life (24 hours). Classic with fish, seafood and asparagus.
Examples: Carpaccio, seafood, asparagus, white fish
Herb Vinaigrette
Classique francaise with fresh finely chopped herbs stirred through: tarragon, chives, parsley, chervil or basil. The herbs reduce the shelf life of the sauce to a maximum of 24-48 hours: fresh herbs contain water and enzymes that break down and oxidize the sauce.
Examples: Warm salad, antipasto, grilled poultry
Asian Sesame Vinaigrette
Rice vinegar + sesame oil + soy sauce + grated ginger + garlic. Ratio: 2:1 rice vinegar to sesame oil (sesame oil is too dominant at 3:1). Neutral salad oil as the base, sesame oil as the aroma component (max 20%). Classic with Asian noodle salads, wakame and roasted duck.
Examples: Noodle salad, wakame, Peking duck, edamame
Warm Bacon Vinaigrette
The rendered fat from freshly cooked bacon is used directly as the hot oil base in the vinaigrette: the hot bacon fat emulsifies with vinegar and is poured over a lukewarm salad. The classic dressing for salade lyonnaise (frisee + fried eggs + lardons). Must be served immediately: once cooled, the bacon fat solidifies.
Examples: Salade lyonnaise, endive salad, frisee with egg
Sources: Escoffier, Le Guide Culinaire (1903), recipe #154; CIA Professional Chef, 9th edition (2011), Chapter 25; Larousse Gastronomique (2009), p.1186
Three common mistakes and how to prevent them
Too acidic or too oily
Vinaigrette always tastes sharper neat than on the salad. Always taste on a leaf or a piece of bread before you judge. If the salad feels too oily: add more vinegar, not less oil. If the sauce is too acidic: add more oil or a teaspoon of honey. The 3:1 ratio is a starting point, not a rule: vinegar type, oil quality and the dish determine the optimal ratio.
Always taste on the final product
Separation during service
Normal and expected with a vinaigrette without extra emulsifier. Shake the bottle or stir with a whisk before each use. A vinaigrette with mustard holds 15-30 minutes without shaking. For long buffets: use a dispenser with a mechanical stirring rod or incorporate honey or egg yolk as an extra emulsifier.
Always shake before use
Shallot too sharp after storage
Fresh shallot in vinaigrette develops a sharp, pungent taste after 24 hours due to enzymatic breakdown and thiosulfinate formation. For day-fresh vinaigrette: fine. For bulk production over multiple days: omit the shallot or blanch for 5 minutes and cool before adding.
Bulk: blanch shallot or omit
Step by step: vinaigrette that does not separate immediately
-
1
Dissolve salt in the vinegar
Pour the vinegar into a bowl or measuring cup. Add the salt and stir until completely dissolved. Salt does not dissolve in oil but does dissolve in the acidic water phase. If you add salt later to an already mixed vinaigrette, you get unevenly seasoned salad: salt crystals in some spots, nothing elsewhere.
Taste the vinegar after the salt has dissolved. You want a clean, briny, acidic flavor without bitterness. This is the moment to calibrate the salt level before the oil goes in. -
2
Add mustard and optional aromatics
Add 1 teaspoon of Dijon mustard per 100ml of sauce and stir into the vinegar. Optional: finely diced shallot, garlic puree or honey. These are the emulsifiers and flavor components of the water phase. Garlic makes the sauce less stable (enzymes) but more intense in flavor. Honey adds light sweetness and improves the emulsion through its sugar structure.
No raw garlic in vinaigrette stored longer than 1 day. Garlic in oil at room temperature can promote Clostridium botulinum growth during extended storage. Under refrigeration at max 7°C this risk is minimal but remains a point of concern. (NVWA Hygiene Code Hospitality 2023; FDA Food Code 2017, §3-302.14) -
3
Add oil while whisking or shaking
Add the oil in a thin stream while whisking, or put everything in a sealed bottle and shake for 30 seconds. The immersion blender method produces the most stable emulsion: the high speed disperses oil droplets smaller than is possible by hand. Smaller droplets mean longer stability.
The mason jar method is fastest for service: vinegar + salt + mustard + oil in a jar with lid, shake 20 seconds. Shake again daily before use. Label the jar with the date. -
4
Season and check temperature
Taste the vinaigrette on a lettuce leaf or a piece of bread, not on its own. On lettuce, a vinaigrette always tastes less acidic than neat. The acidity-oil balance is determined on the leaf, not in the bowl. Adjust with a few drops of vinegar or a drop of honey if the sauce is not right.
Vinaigrette straight from the fridge is always too thick due to the chilled oil. Remove 30 minutes before service or warm slightly au bain-marie and shake again.
HACCP: Storage and garlic safety
Vinaigrette has a low microbiological risk due to its low pH (3-4) which inhibits bacterial growth. The relevant HACCP concern is garlic in oil: fresh garlic in a fat environment at lower temperatures can, in exceptional circumstances, present a botulism risk during extended storage outside refrigeration.
Fresh garlic in oil: botulism concern
Fresh garlic in oil-based sauces (vinaigrette, flavored oil) can, under anaerobic conditions outside refrigeration, present a small risk of Clostridium botulinum when stored for more than 2 hours above 7°C. The low pH of a vinegar-based vinaigrette (pH 3-4) strongly inhibits this risk but does not eliminate it completely.
Protocol: always store vinaigrette with fresh garlic at max 7°C and discard after 7 days. Never use vinaigrette with fresh garlic that has been outside refrigeration for more than 2 hours. (NVWA Hygiene Code Hospitality 2023; FDA Food Code 2017, §3-302.14)
Source: NVWA Hygiene Code for Hospitality (2023); FDA Food Code 2017, §3-302.14 (Protection from Unapproved Additives)
Caesar dressing with raw egg yolk
Restaurant-style Caesar dressing contains raw egg yolk as an emulsifier. The same HACCP rules as mayonnaise apply: maximum 3 days at max 7°C, pasteurized egg yolk for vulnerable populations, refrigerate immediately after preparation.
Many modern restaurant versions use a mayonnaise base as a replacement for fresh egg yolk: this is safer from a HACCP perspective and provides a longer shelf life.
Source: NVWA Hygiene Code for Hospitality (2023), section Raw egg yolk products; FDA Food Code 2017, §3-302.11
HACCP reference table: vinaigrettes and dressings
| Dressing | pH range | Storage temp | Max shelf life | Source |
|---|---|---|---|---|
| Classique without herbs | pH 3.0-3.5 | < 7°C | 5-7 days | NVWA 2023 |
| Vinaigrette with fresh herbs | pH 3.0-3.5 | < 7°C | 24-48 hours | NVWA 2023 |
| Vinaigrette with garlic | pH 3.0-3.5 | < 7°C | Max 7 days | NVWA + FDA 2017 |
| Caesar with raw egg yolk | pH 4.0-4.5 | < 7°C | 3 days | NVWA 2023 |
| Warm bacon vinaigrette | pH 3.5-4.0 | Immediate | Immediate use | CIA 2011 |
Unstable vs stable emulsion: the difference in practice
| Aspect | Unstable emulsion | Stable emulsion |
|---|---|---|
| Emulsifier | None (mechanically mixed only) | Mustard, egg yolk or honey |
| Stability | 5-10 minutes before separation | 30 min (mustard) to 24 hours (egg) |
| Texture | Light, oily after separation | Creamier, more nappe character |
| Use | A la minute, salade lyonnaise, dressing on | Buffet, pre-prepared dressings |
| Shelf life | Limited (must re-mix each time) | Longer, less labor per portion |
I once saw a vinaigrette in a restaurant that had been sitting in a squeeze bottle for six weeks. Constantly topped up, never replaced. It smelled like petroleum and old tin. The chef said it added flavor. I think he could no longer smell it. Fresh vinaigrette, every two days, is the cheapest way to show that you know the difference.
Jeffrey Smit, former kitchen manager
Food cost: the cheapest sauce on the menu
- Material cost classique francaise (1 liter): 750ml olive oil (quality purchase price €8-12/L, so €6-9 for 750ml) + 250ml white wine vinegar (€0.50) + mustard, salt, shallot (€0.30) = approximately €6.80-9.80 per liter. Per portion (30ml): €0.20-0.30.
- Choice of olive oil has the greatest impact: industrial EVOO versus premium Sicilian EVOO can make a €5 per liter difference. For daily bulk production: use a neutral grapeseed oil as base (€2-3/L) and add 20-30% EVOO for aroma. This halves the oil costs without noticeably lowering quality.
- Shelf life as a cost factor: a vinaigrette without fresh herbs and without garlic keeps 5-7 days. With fresh herbs: 24-48 hours. Calculate your daily consumption carefully: a batch of 2 liters that was 3 liters too large and mostly gets discarded is more expensive than daily small batches.
- Margin value: a salad with vinaigrette sells for €8-14. The dressing costs you €0.20-0.50 per portion. This is the best margin on the menu. The problem is not the margin but the consistency: a vinaigrette that is too acidic or too oily costs you more in guest satisfaction than the material savings are worth.
Frequently asked questions: vinaigrette and dressings
Why does my vinaigrette separate so quickly?
Oil and water (vinegar) are naturally immiscible: they do not mix. Without an emulsifier (mustard, egg yolk, honey), a mechanically mixed emulsion is stable for 5-10 minutes. This is normal and expected.
For longer stability: add 1 teaspoon of Dijon mustard per 100ml. The mucilage in mustard seed surrounds the oil droplets and extends stability to 15-30 minutes. With an egg yolk as emulsifier: 24 hours or longer (but this is then technically a light mayonnaise). (McGee 2004, p.632)
What is the best oil-to-vinegar ratio?
The classic 3:1 (oil:vinegar) is the starting point, not the rule. Adjust based on: (1) vinegar type: rice vinegar is mild and calls for 2.5:1, red wine vinegar is bold and sometimes calls for 4:1, (2) the dish: bitter lettuces (endive, frisee) tolerate more acid than soft lettuces (lamb's lettuce, spinach), (3) personal preference and the flavor of the ingredients on the plate.
Always taste on the final product, not neat. (CIA Professional Chef 2011, Ch.25)
How long does vinaigrette keep?
Classique without fresh ingredients: 5-7 days at max 7°C. With fresh herbs: 24-48 hours. With fresh garlic: max 7 days refrigerated. With raw egg yolk (Caesar): max 3 days.
Always store in a sealed glass bottle in the refrigerator. Metal containers impart a metallic aftertaste. Discard vinaigrette with an unpleasant smell or taste immediately: old fat cannot be masked. (NVWA Hygiene Code Hospitality 2023; FDA Food Code 2017)
Can I serve vinaigrette warm?
Yes: the warm bacon vinaigrette is the most well-known example. The hot bacon fat emulsifies spontaneously with vinegar and is poured over a lukewarm salad. The result is a light, aromatic warm dressing that immediately brings a cold salad to lukewarm temperature.
Other warm variants: warm tarragon butter over fish, warm soy-vinegar-sesame oil over steaming noodles. Serving warm requires you to prepare the sauce a la minute: a warm vinaigrette that cools down solidifies and cannot be reheated without separating.
Which oil should I use for the best vinaigrette?
Depending on the purpose: extra virgin olive oil (fruity, intense, dominant) for salads where olive flavor fits, grapeseed oil or peanut oil (neutral, high smoke point) for Asian dressings and as a base oil in high-volume production, sesame oil (exclusively as an aroma component, max 20%) for Asian vinaigrettes, walnut or hazelnut oil (intensely nutty, expensive, oxidizes quickly) for special warm salads.
Never sunflower oil in a classic vinaigrette: too neutral and too greasy in mouthfeel without aroma. Sunflower oil is for mayonnaise, not for vinaigrette. (CIA Professional Chef 2011, Ch.25)
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Food safety & HACCP
The HACCP guidelines, temperatures and storage advice on this page are based on Codex Alimentarius (WHO/FAO) as the global baseline standard and EU Regulation 852/2004. Local laws and regulations may differ. Always consult your national food safety authority for the applicable standards in your region:
- Netherlands: NVWA (nvwa.nl)
- Belgium: FAVV (favv-afsca.be)
- Germany: BfR (bfr.bund.de)
- United Kingdom: FSA (food.gov.uk)
- United States: FDA (fda.gov) — FDA Food Code
- EU general: EU Regulation (EC) 852/2004 on food hygiene
- International: Codex Alimentarius CAC/RCP 1-1969 (revised 2020)
Allergens & dietary information
Allergen information is indicative. When in doubt about allergens in preparations, always contact the supplier or a certified allergological adviser. KitchenNmbrs accepts no liability for allergic reactions or diet-related harm.
Copyright & sources
All sources mentioned (Escoffier, McGee, CIA Professional Chef, etc.) are the property of their respective publishers and authors. KitchenNmbrs cites these works in accordance with fair use for informational purposes. The source attribution at the bottom of each sauce page is not a complete bibliography but an indication of primary sources consulted.
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- Escoffier, Auguste. Le Guide Culinaire. Flammarion, Paris, 1903. Recipe #154 (Vinaigrette). Primary historical reference.
- McGee, Harold. On Food and Cooking: The Science and Lore of the Kitchen. Scribner, New York, 2004. pp.632-633 (emulsions, oil and vinegar, mustard as emulsifier). Scientific reference.
- The Culinary Institute of America (CIA). The Professional Chef, 9th edition. Wiley, Hoboken, 2011. Chapter 25: Cold Sauces and Salad Dressings. Professional kitchen standard.
- NVWA. Hygiene Code for Hospitality, 2023 edition. nvwa.nl. Section: Garlic in oil, raw egg yolk products, storage temperatures. Dutch regulatory framework.
- Larousse Gastronomique. Editions Larousse, Paris, 2009. p.1186 (Vinaigrette). Culinary encyclopedia.
- FDA Food Code 2017. U.S. Food and Drug Administration. §3-302.14, §3-501.16. International reference framework for garlic in oil and temperature control.
HACCP guidelines are based on NVWA Hygiene Code for Hospitality (2023), EU Regulation 852/2004 and FDA Food Code 2017. Local regulations may vary. Consult your local food safety authority for your specific situation.
