Why it works: Liver and fish work together. They rank in the top 9% of all ingredient pairs, and 79 recipes mention both. Both carry 2-nonenal, which smells fatty, green. The science ↓
The recipe
Ingredients
Contains: milk, wheat, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Make the sauce
Rub the flour into the butter until well combined.
Place the mixture in a pan with the water.
Bruise the boiled liver of the fish very fine.
Add cayenne pepper and tarragon vinegar to the liver.
When the butter mixture begins to boil, add the liver mixture and remove from heat.
Serve
Serve in a boat or over the fish.
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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Liver + fishtop 9% of all pairsAroma overlapmoderateMentioned together79 recipes
Shared aroma: 2-nonenal (fatty, green).
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Pepper + tarragontop 3% of all pairsAroma overlapstrongMentioned together1,691 recipes
Shared aroma: estragole (anise, licorice).
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Tarragon + vinegartop 4% of all pairsAroma overlapmoderateMentioned together1,299 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + fishtop 5% of all pairsAroma overlapstrongMentioned together4,432 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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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
- Forms the rich base of the sauce and carries the flavor.
- Flour
- Thickens the butter mixture so the sauce holds together.
- Boiled liver of fish
- Provides the main body and savory flavor of the sauce.
- Tarragon vinegar
- Adds acidity that brightens the rich butter and liver.
The step that matters
Adding the liver mixture to the boiling butter. Once the butter mixture begins to boil, the liver should be added and the pan removed from heat promptly. Overheating a butter and flour emulsion can cause it to separate or turn greasy, so the sauce stays smooth only if heat is controlled.
Flavor stand-ins for the tarragon
How well each one fits the dish's main ingredients (butter, flour, liver, fish, pepper, vinegar):
- Parsleyabout as good a flavor fit
- Thymeabout as good a flavor fit
- Sageabout as good a flavor fit
- Tarragonthe original
Fit is the average pairing score against butter, flour, liver, fish, pepper, vinegar. 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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