Vinaigrette as a named preparation appears in French culinary literature from the 17th century. The name derives from *vinaigre* (vinegar) — acid before oil in the naming as in the preparation. Escoffier's codification established the classical ratio and the mustard emulsifier as standard. The range from the simple three-ingredient version (oil, vinegar, salt) to the complex restaurant version (multiple acids, shallots, herbs, aged mustard) represents the same foundational technique at different levels of complexity.
A vinaigrette is oil and acid — two liquids that do not naturally combine — temporarily dispersed into an emulsion by mechanical force. The classical ratio is 3 parts oil to 1 part acid; the flavour balance is acid-forward because the oil's fat moderates the acid's perception on the palate, making what tastes correct in the bottle taste insufficient on the dressed leaf. A vinaigrette is not a recipe — it is a flavour calibration performed fresh each time.
The vinaigrette's acid-fat balance is one of the most fundamental flavour decisions in cooking — it models the same relationship as lemon juice on fried fish, or acid in a braise. As Segnit notes, the combination of acid and fat works because they serve opposite functions on the palate: fat suppresses bitter and acidic perceptions, while acid cuts fat perception and stimulates salivation. The vinaigrette balances these effects to create a dressing that simultaneously cleanses and coats.
- **Salt dissolves only in acid, not in oil.** Salt must be dissolved in the vinegar before the oil is added. This is the most commonly skipped step and the most visible flaw — undissolved salt granules crunch on the leaf. - **Mustard as emulsifier:** Even a small amount of Dijon mustard (lecithin in the mustard seed) creates a temporary emulsion that holds the dressing together long enough for service. Without it, the oil and vinegar separate within seconds. - **Ratio is a starting point, not a law.** Strong vinegars (sherry, champagne) need more oil. Mild vinegars (rice, white balsamic) may work at 2:1. The cook tastes, adds oil or acid, and tastes again. The calibration is not done until the dressing tastes correct on the actual leaf it will dress. - **Temperature matters:** Cold oil emulsifies less completely than room-temperature oil. Do not dress salads with oil straight from the refrigerator. Decisive moment: The dressing on the leaf — not the dressing in the bottle. The fat coating the leaf's surface suppresses acid perception; the water content of the leaf dilutes the dressing. What tastes correct in the jar will taste flat on the salad. Always taste on a leaf, not on a spoon. Sensory tests: **Sight:** A correctly emulsified vinaigrette is slightly opaque rather than completely clear — the droplets of oil dispersed in the acid scatter light. A completely clear dressing has either not been emulsified or the emulsion has already broken. **Taste on leaf:** The dressing should taste bright and alive — noticeable acid, rounded by fat. If the dressed leaf tastes of oil, add more acid. If it tastes sharp and thin, add more oil.
- Shallots macerated in the vinegar for 10 minutes before the oil is added produce a noticeably rounder, more complex vinaigrette than shallots added after. - Aged red wine vinegar and Dijon is the foundational French vinaigrette. Sherry vinegar and hazlenut oil is its Spanish-inflected cousin. Rice vinegar and sesame oil is the same physics in an Asian register.
— **Flat, undifferentiated flavour:** Salt added to the oil rather than the vinegar — never dissolved. Or acid too mild for the oil quantity. — **Dressing breaks immediately:** Insufficient emulsifier or too much oil added at once. Start again with fresh mustard, dissolve salt in acid, add oil very slowly.
Jacques Pépin's Complete Techniques