Why it works: Pepper and lemon 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
In a saucepan, mix butter, flour, salt, and milk.
Heat the mixture and pour it over the beaten yolks of the eggs.
Place the saucepan in a double boiler and cook gently like custard.
Remove from heat and stir in butter and lemon juice.
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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Pepper + lemontop 3% of all pairsAroma overlapstrongMentioned together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Butter + milktop 7% of all pairsAroma overlapmoderateMentioned together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Butter + flourtop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + milktop 14% of all pairsAroma overlaplowMentioned together78,219 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Milk + lemontop 15% of all pairsAroma overlapmoderateMentioned together19,053 recipes
Shared aroma: 2-nonenal (fatty, 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
- Thicken the sauce and add richness as they set gently with heat.
- Butter
- Adds richness and a smooth, silky mouthfeel to the emulsion.
- Flour
- Stabilizes the sauce by thickening the milk before the eggs are added.
- Milk
- Forms the liquid base that dilutes and softens the rich sauce.
- Lemon juice
- Adds acidity that brightens the flavor and cuts the richness of the butter.
The step that matters
Cook gently in the double boiler. Egg yolks begin to set around 140°F and scramble above that, so gentle, indirect heat keeps the sauce smooth and custard-like rather than curdled.
“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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