Why it works: Butter and flour are a kitchen classic. They rank in the top 12% of all ingredient pairs, and 124,287 recipes mention both. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Oyster Soup
Ingredients
Directions
Prepare
Strain the prepared soup.
Make the soup
In a mortar, beat the yolks of 10 hard‑boiled eggs with the hard part of 1 pint of oysters.
Add this mixture, along with the oyster liquor and remaining oysters, to the strained soup.
Simmer the soup for about 30 minutes.
Beat the yolks of 6 raw eggs and add them to the soup.
Stir the mixture over low heat until it thickens and becomes smooth, ensuring it does not boil.
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 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Oyster + buttertop 12% of all pairsAroma overlapmoderateMentioned together8,184 recipes
Shared aroma: 2,6-nonadienal (cucumber, green).
-
Egg + oystertop 14% of all pairsAroma overlapmoderateMentioned together4,103 recipes
Shared aroma: 2-nonenal (fatty, green).
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Egg + flourtop 15% of all pairsAroma overlaplowMentioned together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
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
- Hard-boiled egg yolks
- Mashed into the oysters to enrich the soup and give it a smooth, rich body.
- Raw egg yolks
- Thicken the soup as they gently set over low heat, giving it a smooth texture.
- Oysters
- Provide the main oyster flavour and, with their liquor, the savoury base of the soup.
The step that matters
Stir the mixture over low heat until it thickens. Raw egg yolks set through gentle heat. If the soup boils, the yolks can curdle and turn grainy instead of smooth and thick.
Flavor stand-ins for the lemon
How well each one fits the dish's main ingredients (egg, oyster, butter, flour):
- Raisinbetter flavor fit
- Lemonthe original
- Vanillaabout as good a flavor fit
- Figabout as good a flavor fit
Fit is the average pairing score against egg, oyster, butter, flour. 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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