Why it works: Lemon and butter are a kitchen classic. They rank in the top 16% of all ingredient pairs, and cooks put them together in 41,227 recipes. Both carry 3-hexenal, which smells apple, fruity. The science ↓
Hollandaise Sauce
Ingredients
Directions
Make the reduction
Boil vinegar with peppercorns until reduced by half.
Strain and cool the vinegar.
Make the sauce
In a saucepan, combine half the butter (cut into small pieces), egg yolks, a pinch of salt, and the cooled vinegar.
Set the saucepan over boiling water and stir continuously with a wooden spoon until smooth.
Strain the mixture into another saucepan.
Return it to the boiling water, stirring steadily.
Gradually add the remaining butter in small pieces and the stock.
When the sauce is light and frothy, remove from heat and stir in lemon juice.
Serve immediately.
Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.
Explore the science
The flavor team
The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.
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Lemon + buttertop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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Egg + lemontop 19% of all pairsSmell alikelowCooked together44,316 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
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Vinegar + lemontop 20% of all pairsSmell alikemoderateCooked together7,334 recipes
Shared aroma: acetic acid (sour, vinegar).
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Vinegar + buttertop 23% of all pairsSmell alikemoderateCooked together13,513 recipes
Shared aroma: isoamyl acetate (banana, pear).
Egg and lemon barely smell alike, yet cooks put them together in 44,316 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Emulsify with the butter and thicken the sauce as they gently cook.
- Butter
- Provides fat that, emulsified with the yolks, gives the sauce its rich, smooth body.
- Vinegar
- Adds acidity that balances the richness and helps stabilise the emulsion.
- Lemon juice
- Adds bright acidity and fresh flavour at the end.
The step that matters
Keeping the yolks over gentle heat. Egg yolks scramble if they get too hot, and the sauce breaks into greasy curds. Keep the water at a gentle simmer, not a hard boil, and stir constantly so the yolks thicken smoothly into an emulsion with the butter.
Swap the lemon
How well each one fits the dish's main ingredients (vinegar, egg, butter):
- Strawberryfits about as well
- Currantfits about as well
- Raspberryfits about as well
- Lemonthe original
Fit is the average pairing score against vinegar, egg, butter. Candidates are from the same food group and used in at least 100 recipes.
“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.
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