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Caper Sauce for Fish

A sauce made with capers, vinegar, butter, anchovy/mushroom/walnut ketchup, and cayenne pepper.

From an old cookbook · modernised transcription
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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

  1. Stir the chopped capers and vinegar into the melted butter.

  2. Place the mixture over gentle heat and let it simmer.

  3. Once simmering, stir in the essence of anchovy, mushroom, or walnut ketchup.

  4. Season the sauce with cayenne pepper to taste.

Recipe from a historical cookbook (Internet Archive).

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.

  1. Capers + anchovytop 8% of all pairs
    Smell alikemoderate
    Cooked together473 recipes

    Shared aroma: 2-methylbutyraldehyde (malty, chocolate).

  2. Capers + peppertop 12% of all pairs
    Smell alikemoderate
    Cooked together2,088 recipes

    Shared aroma: coumarin (sweet, hay).

  3. Butter + anchovytop 13% of all pairs
    Smell alikemoderate
    Cooked together3,697 recipes

    Shared aroma: decanal (soap, orange peel).

  4. Vinegar + peppertop 14% of all pairs
    Smell alikemoderate
    Cooked together27,814 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  5. Capers + buttertop 16% of all pairs
    Smell alikemoderate
    Cooked 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):

  1. Parsleyfits better
  2. Tarragonfits about as well
  3. Thymefits about as well
  4. 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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