A classic vinaigrette ratio is typically oil to acid at what proportion?

• A. 3:1
• B. 1:3
• C. 2:1
• D. 1:1

Answer: (A)

Balancing oil and acid in a vinaigrette to achieve a smooth emulsion and a harmonious flavor. The classic vinaigrette uses three parts oil to one part acid. Oil provides richness and helps the dressing cling to greens, while the acid supplies brightness and cuts through the fat. That 3:1 balance creates a dressing that emulsifies well when you whisk or shake it, and coats leaves nicely without tasting overly sharp. If you swapped in more acid—one part oil to three parts acid—the dressing would be too tart and thin. If you kept it at equal parts, the acid would dominate and the dressing would feel more sharp and less creamy. A two-to-one ratio is still oil-forward, giving a stronger profile, but it isn’t the traditional standard. So three parts oil to one part acid is the traditional ratio.