Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Hollandaise Sauce
Ingredients
Directions
Make the sauce
Melt the butter in a saucepan that fits into a kettle.
Whisk in the egg yolk, salt, and cayenne pepper.
Add the boiling water and cider vinegar, then cook and stir until slightly thickened.
Add a few drops of lemon juice if desired.
Hold and serve
Keep the sauce hot and covered to prevent a crust from forming.
Serve with fish.
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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Pepper + lemontop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Cider + vinegartop 6% of all pairsSmell alikemoderateCooked together3,431 recipes
Shared aroma: 4-ethyl-2-methoxyphenol (smoky, clove).
-
Pepper + vinegartop 14% of all pairsSmell alikemoderateCooked together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Butter + lemontop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Butter + eggtop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolk
- Emulsifies the melted butter and thickens the sauce as it cooks gently.
- Butter
- Provides fat for a rich texture and smooth, glossy mouthfeel.
- Cider vinegar
- Adds acidity that brightens the flavor and balances the richness of the butter.
The step that matters
Cook and stir until slightly thickened. The egg yolk thickens as it heats, but too much heat can scramble it. Gentle, constant stirring keeps the sauce smooth and prevents lumps.
Swap the lemon
The recipe marks lemon as optional. How well each one fits the dish's main ingredients (butter, egg, pepper, cider, vinegar):
- Plumfits about as well
- Applefits about as well
- Lemonthe original
- Pineapplefits about as well
Fit is the average pairing score against butter, egg, pepper, cider, vinegar. 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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