Why it works: Butter and egg match in chemistry and in kitchens. They rank in the top 8% of all ingredient pairs, and 118,511 recipes mention both. Both carry nonanal, which smells fat, citrus. The science ↓
The recipe
Ingredients
Contains: egg, milk, wheat (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
The book gives no cooking times; the times in the steps were added in transcription, so check for doneness rather than trusting the clock.
Make the sauce
Melt the butter in a saucepan over low heat.
Stir in the flour and cook for 1 minute.
Gradually add the milk, stirring constantly until thickened.
Season with pepper, salt, parsley, and lemon juice.
Finish and serve
In a separate bowl, beat the eggs and then add them to the sauce.
Cook gently, stirring until the eggs are just set.
Serve immediately.
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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Butter + eggtop 8% of all pairsAroma overlapstrongMentioned together118,511 recipes
Shared aroma: nonanal (fat, citrus).
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Parsley + lemontop 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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Pepper + lemontop 2% of all pairsAroma overlapstrongMentioned together27,039 recipes
Shared aroma: 2-nonenal (fatty, green).
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Butter + milktop 3% of all pairsAroma overlapstrongMentioned together81,222 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Butter
- Enriches the sauce with fat, giving it a rich, smooth mouthfeel.
- Flour
- Thickens the butter and milk into a stable sauce base.
- Milk
- Forms the liquid body of the sauce, which thickens as it heats.
- Eggs
- Set gently with heat to thicken and give the sauce body.
The step that matters
Cook gently, stirring until the eggs are just set. Egg proteins set at moderate heat and curdle if overheated, turning the sauce grainy. Low heat and constant stirring keep it smooth and creamy.
Flavor stand-ins for the parsley
How well each one fits the dish's main ingredients (butter, flour, milk, pepper, lemon, egg):
- Parsleythe original
- Cardamomabout as good a flavor fit
- Nutmegabout as good a flavor fit
Fit is the average pairing score against butter, flour, milk, pepper, lemon, egg. 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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