Why it works: Parsley and pepper match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 34,118 recipes mention both. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓
The recipe
Ingredients
Contains: egg, milk, wheat (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Make the sauce
In a saucepan, stir the flour and half the butter over a bain-marie for about 3 minutes.
Slowly pour in enough stock or broth to dilute the sauce.
Remove from heat and mix in the stirred egg yolks.
Finish and serve
Return to the bain-marie and stir in the remaining butter just before serving.
Add chopped parsley or shallot for extra flavor, and season with pepper and salt if needed.
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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Parsley + peppertop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Butter + flourtop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + parsleytop 8% of all pairsAroma overlapmoderateMentioned together28,543 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Butter + eggtop 8% of all pairsAroma overlapstrongMentioned together118,511 recipes
Shared aroma: nonanal (fat, citrus).
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Flour + eggtop 8% of all pairsAroma overlaplowMentioned together104,138 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour share little aroma chemistry, yet 122,858 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 a smooth, glossy mouthfeel to the sauce.
- Flour
- Thickens the sauce as its starch swells in the warm liquid.
- Stock or broth
- Forms the liquid base that gives the sauce its savoury flavor.
- Egg yolks
- Enriches the sauce and thickens it when gently heated.
The step that matters
Mixing in the egg yolks. Egg yolks thicken through gentle heat; if the sauce is too hot when they go in, they can scramble and turn grainy. Removing it from the heat first helps keep it smooth.
Flavor stand-ins for the parsley
The recipe marks parsley as optional. How well each one fits the dish's main ingredients (butter, flour, egg, pepper):
- Parsleythe original
- Nutmegabout as good a flavor fit
Fit is the average pairing score against butter, flour, egg, pepper. 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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