Why it works: Lemon and parsley match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and 14,036 recipes mention both. Both carry beta-phellandrene, which smells minty, terpene. 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
Melt the butter in a small saucepan.
Gradually stir in the flour and continue stirring for 5-10 minutes until well blended.
Slowly add the boiling cream and veal stock, a few spoonfuls at a time, stirring well and allowing to simmer for 1-2 minutes between additions.
Once smooth, add the strained lemon juice or chili vinegar, pepper, salt, and chopped parsley.
Enrich or simplify
For a richer sauce, mix in the egg yolks and reduce the flour to half.
For a plainer version, thicken the milk with 1 ounce of butter and 1 heaped teaspoon of flour, then flavor with lemon juice, pepper, and salt.
Add the parsley and lemon juice off the heat.
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 + parsleytop 1% of all pairsAroma overlapstrongMentioned together14,036 recipes
Shared aroma: beta-phellandrene (minty, terpene).
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Pepper + parsleytop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Lemon + peppertop 2% of all pairsAroma overlapstrongMentioned together27,039 recipes
Shared aroma: 2-nonenal (fatty, green).
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Butter + creamtop 3% of all pairsAroma overlapstrongMentioned together41,494 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Butter + flourtop 6% of all pairsAroma overlaplowMentioned together122,858 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
- Carries the flavor and forms the base of the roux, giving the sauce richness.
- Flour
- Cooked with the butter, it thickens the sauce into a smooth, body-rich texture.
- Boiling cream
- Adds richness and a smooth, silky mouthfeel.
- Veal stock
- Contributes savory depth and body to the sauce.
- Lemon juice
- Adds acidity that brightens the buttery sauce and balances its richness.
- Egg yolks
- Thicken and enrich the sauce, adding fat and a custard-like texture.
The step that matters
Adding the boiling cream and stock slowly. Adding hot liquid a few spoonfuls at a time while stirring lets the flour starch disperse evenly, which prevents lumps and keeps the sauce smooth.
“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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