Why it works: Butter and flour are a kitchen classic. They rank in the top 6% of all ingredient pairs, and 122,858 recipes mention both. Both carry isobutyraldehyde, which smells malty, green. 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 separate pan, mix flour with the water from the cooked beans.
Add the egg yolks and season with coarse sea salt.
Thicken the mixture over low heat, then pour it over the beans.
Finish the beans
Stir the maître d’Hôtel butter into the hot French beans.
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 + flourtop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + eggtop 8% of all pairsAroma overlapstrongMentioned together118,511 recipes
Shared aroma: nonanal (fat, citrus).
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Beans + flourtop 8% of all pairsAroma overlapmoderateMentioned together1,909 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + eggtop 8% of all pairsAroma overlaplowMentioned together104,138 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + beanstop 10% of all pairsAroma overlapstrongMentioned together2,792 recipes
Shared aroma: 2,3-pentanedione (butter, sweet).
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
- Egg yolks
- Thicken the sauce and add richness as they set gently over low heat.
- Flour
- Thickens the bean cooking water into a smooth, stable base for the sauce.
- Maitre d’hotel butter
- Adds fat and richness, carrying the herb flavour over the hot beans.
The step that matters
Thicken the mixture over low heat. Egg yolks scramble if they get too hot, turning the sauce grainy. Gentle heat lets them thicken smoothly while the flour holds the liquid stable.
Flavor stand-ins for the beans
How well each one fits the dish's main ingredients (butter, flour, egg):
- Almondbetter flavor fit
- Pecansbetter flavor fit
- Walnutbetter flavor fit
- Beansthe original
Fit is the average pairing score against butter, flour, 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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