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
Beat the butter to a cream with a silver spoon.
Add the egg yolks one at a time, beating well after each addition.
Stir in the lemon juice, salt, and pepper.
About five minutes before serving, gradually add the boiling water while stirring well.
Place the bowl in a saucepan of boiling water and stir rapidly until the sauce thickens like boiled custard.
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 + lemontop 16% of all pairsAroma overlapmoderateMentioned together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Butter + eggtop 17% of all pairsAroma overlapmoderateMentioned together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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Lemon + eggtop 19% of all pairsAroma overlaplowMentioned together44,316 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
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Butter + peppertop 21% of all pairsAroma overlapmoderateMentioned together85,593 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
Lemon and egg share little aroma chemistry, yet 44,316 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
- Provides fat and richness, giving the sauce a smooth, silky mouthfeel.
- Egg yolks
- Emulsify with the butter and thicken into a custard-like texture when gently heated.
- Lemon juice
- Adds acidity that brightens the flavour and balances the richness of the butter.
- Boiling water
- Adds moisture that loosens the sauce to a pourable consistency.
The step that matters
Thickening over boiling water. Egg yolks scramble if they get too hot. Stirring rapidly over simmering water heats them gently so they thicken smoothly like custard 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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