How to Make Vinaigrette (the 3:1 Ratio and Beyond)
Quick steps (5 min)
You need: small bowl and whisk, or a jar with a tight lid, measuring spoons
A vinaigrette is a simple dressing made by combining one part acid (vinegar or citrus juice) with about three parts oil, plus salt and usually mustard to help the two stay blended. Whisk or shake until it turns cloudy and slightly thick, and it's ready.
Why vinaigrette works
Oil and vinegar are immiscible: they won't stay mixed on their own. Whisking or shaking breaks the oil into small droplets dispersed through the vinegar, making a temporary emulsion. Without help, those droplets merge and rise within minutes.
An emulsifier slows that down. Dijon mustard is the classic choice: its ground seed coats contain mucilage, a sticky carbohydrate that thickens the water phase and coats oil droplets. Honey, egg yolk (with its lecithin), miso, tahini, and a spoonful of mayonnaise also help.
Salt matters for chemistry, too. It dissolves in vinegar but not in oil, so season the acid first. The salt also mellows harsh acidity.
Ratios
| Style | Oil : acid | Example (makes about 60 mL / 1/4 cup) |
|---|---|---|
| Classic French | 3 : 1 | 45 mL oil + 15 mL red wine vinegar |
| Brighter | 2 : 1 | 40 mL oil + 20 mL lemon juice |
| Mellow acids (balsamic, rice) | 2 : 1 | 40 mL oil + 20 mL balsamic |
| Very sharp acids (sherry, distilled) | 4 : 1 | 48 mL oil + 12 mL sherry vinegar |
Acid strength varies. Most wine vinegars are around 5–7% acetic acid; lemon juice is around 5% citric acid but tastes softer to many people. Treat ratios as a starting point and adjust by taste.
Choosing oil and acid
Oils: Extra-virgin olive oil for flavour, neutral oils (canola, sunflower, grapeseed) for delicate greens, or a blend. Nut oils like walnut or hazelnut are lovely as a portion of the oil, around a quarter.
Acids: Red or white wine vinegar, sherry vinegar, champagne vinegar, balsamic, apple cider vinegar, rice vinegar, lemon, lime, or orange juice. If you run out of one, see the lemon juice, apple cider vinegar, or rice vinegar substitutes.
Steps
- Mince aromatics if using: a small shallot (about 1 tablespoon minced) or half a garlic clove.
- Combine the acid with salt and aromatics in a bowl, using about 1/4 teaspoon fine salt per 15 mL / 1 tablespoon of vinegar. Let it sit 5 minutes. The acid softens the raw bite of the shallot.
- Whisk in 1 teaspoon of Dijon mustard per batch, plus 1/2–1 teaspoon honey or maple syrup if you like a touch of sweetness.
- Drizzle in the oil slowly, whisking constantly, until the dressing turns opaque and slightly thickened.
- Or use a jar. Add everything, seal tightly, and shake hard for 15–20 seconds. Less elegant, equally tasty.
- Taste on a leaf of the salad you're dressing, not off a spoon. Greens dilute flavour, so the dressing should taste slightly too strong on its own.
- Dress just before serving, about 1 tablespoon per 2 packed cups (about 60 g) of greens. Toss gently with your hands or tongs.
Variations
- Dijon vinaigrette: Red wine vinegar, 1 tablespoon Dijon, shallot, olive oil.
- Balsamic: Balsamic vinegar, a little Dijon, garlic, olive oil.
- Lemon: Lemon juice and zest, honey, olive oil, black pepper.
- Honey mustard: Cider vinegar, equal parts Dijon and honey, neutral oil.
- Sesame-ginger: Rice vinegar, soy sauce, grated ginger, toasted sesame oil blended with neutral oil.
- Warm bacon vinaigrette: Render bacon, then whisk sherry vinegar and Dijon into the warm fat. Great on spinach or frisée.
Common mistakes and fixes
Separates right away. Not enough emulsifier, or the oil was dumped in at once. Add more mustard and whisk again, or shake hard in a jar right before serving.
Too sharp. Add more oil, a little honey, or a pinch more salt, which also reduces the perception of sourness.
Flat or oily. Add acid a few drops at a time, plus a pinch of salt.
Greens are wilted and soggy. You dressed them too early or too heavily. Acid and salt draw water from leaves by osmosis. Dress right before serving, and dry greens thoroughly in a salad spinner first, since water also stops oil from clinging.
Bitter taste. Strong extra-virgin olive oil blended at high speed can turn bitter. Whisk by hand, or use part neutral oil.
Storage
Oil and vinegar on their own keep about 2 weeks in the fridge. Vinaigrettes with fresh garlic, shallot, or herbs should be refrigerated and used within 3–4 days. Garlic in oil held at room temperature carries a botulism risk, so always store those dressings cold.
Questions
What is the ratio for vinaigrette?
The classic ratio is 3 parts oil to 1 part acid by volume, for example 45 mL (3 tbsp) oil to 15 mL (1 tbsp) vinegar. For sharper dressings, use 2:1; for mellow vinegars like balsamic or rice vinegar, 2:1 often tastes balanced.
Why does my vinaigrette separate?
A vinaigrette is a temporary emulsion. Without enough emulsifier, oil droplets merge and float back to the top. Adding mustard, honey, or a little mayonnaise keeps it creamy longer, and a quick shake re-emulsifies it.
How long does homemade vinaigrette last?
Plain oil-and-vinegar vinaigrette keeps up to 2 weeks in the fridge. If it contains fresh garlic, shallot, or herbs, refrigerate it and use within 3–4 days.
Why does vinaigrette solidify in the fridge?
Olive oil starts to cloud and thicken at fridge temperatures. Let it sit at room temperature for 10–15 minutes, then shake.
Should you add salt to the vinegar or the oil?
Dissolve the salt in the vinegar first. Salt dissolves in water-based liquids but not in oil, so adding it to the vinegar seasons the dressing evenly.