Which method helps prevent a vinaigrette from separating after mixing?

• A. Whisking vigorously or shaking
• B. Simmering
• C. Freezing
• D. Grilling

Answer: (A)

Forming and maintaining an emulsion is what prevents a vinaigrette from separating after mixing. Oil and vinegar don’t mix naturally, so breaking them into tiny oil droplets suspended in the vinegar creates a temporary emulsion. Whisking vigorously or shaking the mixture breaks the oil into small droplets and disperses them evenly, so the vinaigrette stays combined longer. If you heat it by simmering, the emulsion tends to break because heat makes the oil want to separate and can alter flavors. Freezing would freeze the components and then separate upon thawing, and grilling has no role in emulsification. For longer-term stability, you can use an emulsifier like mustard or egg yolk, or re-emulsify by whisking again before serving.