Why it works: Lemon and mustard match in chemistry and in kitchens. They rank in the top 11% of all ingredient pairs, and 3,816 recipes mention both. Both carry eucalyptol, which smells eucalyptus, herbal. The science ↓
Hollandaise Sauce
Ingredients
Directions
Make the sauce
In a saucepan, melt the butter and mix in the flour over medium heat.
Gradually add the boiling water while stirring continuously.
Remove from heat and stir in the egg yolks, lemon juice or vinegar, salad oil, and mustard if desired.
Serve
Serve the sauce warm 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 aroma chemistry they share, and how many recipes mention both.
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Lemon + mustardtop 11% of all pairsAroma overlapstrongMentioned together3,816 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
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Butter + flourtop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + mustardtop 13% of all pairsAroma overlapmoderateMentioned together5,066 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).
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 richness and fat, giving the sauce a smooth, silky body.
- Flour
- Thickens the sauce as it combines with the melted butter and water.
- Egg yolks
- Emulsify the fat and water and set into a creamy, rich texture.
- Lemon juice or vinegar
- Adds acidity that balances the richness of the butter and yolks.
- Salad oil
- Adds fat that helps create a smooth, stable emulsion with the yolks.
The step that matters
Stir in the egg yolks off the heat. Egg yolks scramble when exposed to high heat. Removing the saucepan from the heat before adding them lets the yolks thicken gently and emulsify smoothly instead of curdling.
Flavor stand-ins for the mustard
The recipe marks mustard as optional. How well each one fits the dish's main ingredients (butter, flour, egg, lemon):
- Shallotbetter flavor fit
- Arrowrootbetter flavor fit
- Leekbetter flavor fit
- Mustardthe original
Fit is the average pairing score against butter, flour, egg, lemon. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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