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Quick ratios, temperature ranges, and common pitfalls for the five most common sauce types.
If the butter is too hot, the yolks scramble. Too cold and it won't emulsify. Aim for the warmth of a hot bath.
Vinaigrettes are temporary emulsions. They will always separate in the fridge. That is normal.
Cold oil is harder to emulsify. Take the chill off your oil if your kitchen is cold.
Adding cold butter at the end gives pan sauces their glossy sheen and smooth mouthfeel.
Once you add butter, the pan should feel warm, not hot. Heat is the enemy at this stage.
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The number one reason emulsions break. Whether it is butter into hollandaise or oil into mayo, the first quarter needs to go in slowly. A thin stream or even drops. Once you have a stable base, you can speed up.
Too hot and your egg proteins seize. Too cold and the fat solidifies before it can bond. Hollandaise wants warmth. Mayo wants room temperature. Pan sauces want controlled heat.
Mustard in vinaigrette. Egg yolk in mayo. These are not optional extras. They are the glue that holds fat and water together. Without them, you are just shaking oil and vinegar.
Situation: You are making hollandaise for six people. The sauce looks great, then suddenly turns grainy right as guests sit down.
What happened: The bowl got too hot, likely from the simmering water below. The egg proteins overcooked.
Fix: Strain out the lumps through a fine sieve. In a clean bowl, whisk one fresh egg yolk with 1 tsp warm water. Slowly whisk in the strained sauce. It will come back together. Keep the heat lower this time.
Situation: You are making a double batch of mayo in a food processor. After three minutes of pouring in oil, it is still runny.
What happened: The oil may have been too cold, or the processor blade was not close enough to the yolk at the start.
Fix: Scoop the runny mixture into a bowl. Whisk a fresh yolk with a splash of water in a separate bowl. Very slowly whisk the failed batch into the new yolk. It will thicken within a minute.
Situation: Your red wine pan sauce looked perfect at the stove. Five minutes later at the table, there is a slick of butter on top.
What happened: The sauce cooled enough that the butter solidified and separated. This is common with butter-finished sauces.
Fix: Warm the sauce gently over low heat while whisking. It will re-emulsify. Add a teaspoon of warm water if it fights you. Serve immediately.
Last updated: January 2026 · v1.2