To emulsify is to disperse one liquid into another liquid that does not normally mix with it, creating an emulsion. In cooking, the most common example is dispersing droplets of oil in a water-based liquid or the reverse. An emulsifier, such as egg-yolk lecithin or mustard components, can help stabilize the mixture.
Whisking, blending or another form of mechanical action breaks one liquid into small droplets and distributes them through the other. Emulsifiers help reduce the tendency of the droplets to merge and separate. The stability depends on the ingredients, droplet size, temperature, acidity and mixing method.
Start with the appropriate aqueous phase and emulsifier where needed. Add the dispersed liquid gradually while whisking or blending, and control temperature so the mixture does not split. The order of addition and the ratio of oil to water influence the result.
An emulsion contains droplets of one liquid dispersed in another. A suspension contains solid particles distributed through a liquid. A vinaigrette is an emulsion when mixed, while flour or spice particles suspended in liquid are not necessarily emulsions.
Chef’s tip: If a mayonnaise or warm butter sauce begins to split, stop adding fat and rebuild the emulsion with a small amount of the appropriate aqueous phase or a fresh emulsifier base.
Key distinction: Emulsifying combines immiscible liquids into a dispersed system; it does not mean dissolving one liquid into another.
This term is one of hundreds covered in depth across OCS courses, learning paths, and 1-on-1 coaching with Chef Eric.
