Why it works: Capers and anchovy work together. They rank in the top 8% of all ingredient pairs, and cooks put them together in 473 recipes. Both carry 2-methylbutyraldehyde, which smells malty, chocolate. The science ↓
Caper Sauce for Fish
Ingredients
Directions
Stir the chopped capers and vinegar into the melted butter.
Place the mixture over gentle heat and let it simmer.
Once simmering, stir in the essence of anchovy, mushroom, or walnut ketchup.
Season the sauce with cayenne pepper to taste.
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 their aromas overlap, and how often cooks already put them together.
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Capers + anchovytop 8% of all pairsSmell alikemoderateCooked together473 recipes
Shared aroma: 2-methylbutyraldehyde (malty, chocolate).
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Capers + peppertop 12% of all pairsSmell alikemoderateCooked together2,088 recipes
Shared aroma: coumarin (sweet, hay).
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Butter + anchovytop 13% of all pairsSmell alikemoderateCooked together3,697 recipes
Shared aroma: decanal (soap, orange peel).
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Vinegar + peppertop 14% of all pairsSmell alikemoderateCooked together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Capers + buttertop 16% of all pairsSmell alikemoderateCooked together1,637 recipes
Shared aroma: isobutyraldehyde (malty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Capers
- Provide a sharp, briny flavour that cuts through the rich butter.
- Melted butter
- Forms the rich, fluid base that carries the other flavours.
- Vinegar
- Adds acidity that brightens the buttery sauce.
- Essence of anchovy, mushroom, or walnut ketchup
- Contributes concentrated savoury depth and umami.
The step that matters
Simmering after adding the ketchup essence. Gentle heat keeps the butter emulsified and prevents it from separating or scorching, which would leave the sauce greasy and grainy.
Swap the capers
How well each one fits the dish's main ingredients (vinegar, butter, anchovy, pepper):
- Parsleyfits better
- Tarragonfits about as well
- Thymefits about as well
- Capersthe original
Fit is the average pairing score against vinegar, butter, anchovy, pepper. Candidates are from the same food group and used in at least 100 recipes.
“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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