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 sauce base
Melt the butter in a saucepan.
Add the flour and stir to combine.
Pour in the boiling water and stir until thickened.
Season and finish
Add the lemon juice, salt, and cayenne pepper.
Just before serving, stir in the beaten egg yolk.
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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Flour + eggtop 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
- Butter
- Adds fat and richness, giving the sauce a smooth, silky mouthfeel.
- Flour
- Thickens the liquid into a smooth base as it cooks with the water.
- Egg yolk
- Emulsifies with the butter and sets slightly, enriching the sauce's body.
- Lemon juice
- Adds acidity that brightens the flavor and balances the richness of the butter and yolk.
The step that matters
Stirring in the egg yolk. Egg yolk can scramble if the sauce is too hot. Adding it just before serving, off the heat or at low heat, lets it thicken gently and emulsify smoothly instead of curdling.
“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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