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TechniqueFebruary 16, 2026Β· 5 min read

The Magic of Emulsification: Oil and Water United

Mayonnaise, vinaigrette, cream sauce β€” how oil and water become one.

Oil and Water Don't Naturally Mix

What Is Emulsification?

Breaking oil into tiny droplets suspended in water, held together by emulsifiers β€” molecules that love both oil and water.

Common Emulsifiers

EmulsifierFound InUsed For
Lecithin (egg yolk)EggsMayo, hollandaise
MustardMustard seedsVinaigrette
CaseinMilkCream sauces

Why Mayo Doesn't Separate

Egg yolk lecithin wraps each tiny oil droplet, preventing them from merging back together.

Perfect Vinaigrette

  1. Start with 1 tsp mustard β€” natural emulsifier
  2. Add vinegar and mix
  3. Drizzle oil in very slowly while whisking vigorously
  4. Faster whisking = smaller droplets = more stable

Why Emulsions Break

  • Temperature changes β€” too hot or cold
  • Too much oil at once β€” add slowly
  • Not enough mixing β€” droplets recombine

Fixing a Broken Emulsion

  1. Fresh bowl + 1 egg yolk
  2. Add broken emulsion drop by drop while whisking
  3. Gradually increase as emulsion reforms

Remember: The key is "slowly, little by little, keep stirring"!