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Sauce

Butter Sauce for Boiled Fish

A butter and flour sauce with water, parsley, egg yolk, and salt for boiled fish.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and flour are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Butter Sauce for Boiled Fish

Ingredients

Directions

  1. Melt the butter in a saucepan over a kettle of boiling water.

  2. Stir in the flour until smooth.

  3. Add the boiling water and parsley, and bring to a boil.

  4. Remove from heat and stir in the egg yolk and salt 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. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Flour + parsleytop 12% of all pairs
    Smell alikemoderate
    Cooked together16,675 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  3. Butter + parsleytop 15% of all pairs
    Smell alikemoderate
    Cooked together28,563 recipes

    Shared aroma: trans-2-hexenal (green, leafy).

  4. Flour + eggtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Butter + eggtop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

Butter and flour barely smell alike, yet cooks put them together in 124,287 recipes: they 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
Provides fat and rich flavor, and helps form the base of the sauce.
Flour
Thickens the sauce as it cooks with the butter and liquid.
Egg yolk
Enriches the sauce and thickens it gently when stirred in off the heat.

The step that matters

Stir in the egg yolk off the heat. Egg yolk can scramble and curdle if it meets high heat, so it is added after the sauce is removed from the heat and stirred in gently.

Swap the parsley

How well each one fits the dish's main ingredients (butter, flour, egg):

  1. Capersfits better
  2. Nutmegfits better
  3. Jalapenofits about as well
  4. Parsleythe 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.

“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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