Why it works: Lemon and pepper match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 27,047 recipes mention both. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Hollandaise Sauce
Ingredients
Directions
Make the roux
Melt the butter in a saucepan.
Add the flour and fry gently without browning for a few minutes.
Stir in the water and bring to a boil.
Boil for four to five minutes, then remove from heat.
Finish the sauce
Stir in the egg yolks one by one.
Place over gentle heat or in a pan of boiling water, stirring until the sauce thickens.
Do not allow the sauce to boil or it will curdle.
Season with salt and cayenne pepper.
Just before serving, add the lemon juice or a little tarragon vinegar.
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 aroma chemistry they share, and how many recipes mention both.
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Lemon + peppertop 3% of all pairsAroma overlapstrongMentioned together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Butter + flourtop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Egg + flourtop 15% of all pairsAroma overlaplowMentioned together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + lemontop 16% of all pairsAroma overlapmoderateMentioned together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Flour + lemontop 17% of all pairsAroma overlapmoderateMentioned together30,404 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour share little aroma chemistry, yet 124,287 recipes mention both: they likely 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 and thicken the sauce as they set gently with heat.
- Butter
- Adds richness and fat that carries flavour and smooth texture.
- Flour
- Thickens the water and butter into a stable base for the sauce.
- Lemon juice
- Adds acidity that brightens the rich, creamy sauce.
The step that matters
Keep the sauce below boiling once the yolks go in. Egg yolks begin to scramble and curdle when overheated, so the sauce must thicken gently over low heat rather than boil.
“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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