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Sauce

Lean ‘Villeroi’-sauce

A fish broth sauce thickened with roux, mushrooms, parsley, and egg yolks.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and mushroom are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 12,525 recipes. Both carry trans-2-decenal, which smells waxy, orange. The science ↓

Lean ‘Villeroi’-sauce

Ingredients

Directions

Make the roux

  1. Strain the fish broth through a cloth and keep it warm.

  2. In a pan, melt the butter and add the flour to make a yellow roux, cooking over moderate heat.

  3. Gradually add the fish broth to the roux, stirring until it begins to boil.

Simmer and finish

  1. Add the mushrooms and parsley, and if the sauce is too thick, lighten it with a few tablespoons of broth.

  2. Boil the sauce for 12‑15 minutes, then strain it into a flat stewpan.

  3. Reduce the sauce until it reaches a good consistency.

  4. Season the sauce and stir in the egg yolks, cooking gently without boiling.

  5. Remove from heat and set aside for use.

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 + mushroomtop 7% of all pairs
    Smell alikemoderate
    Cooked together12,525 recipes

    Shared aroma: trans-2-decenal (waxy, orange).

  2. Mushroom + parsleytop 11% of all pairs
    Smell alikemoderate
    Cooked together6,132 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  3. Fish + buttertop 12% of all pairs
    Smell alikemoderate
    Cooked together4,488 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  4. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Fish + mushroomtop 12% of all pairs
    Smell alikemoderate
    Cooked together444 recipes

    Shared aroma: 1-octen-3-one (mushroom, metallic).

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

Fish broth
Forms the liquid base that the roux thickens into a sauce.
Butter
Carries the flour into a roux and adds richness to the sauce.
Flour
Thickens the sauce when cooked in fat to form a roux.
Egg yolks
Enrich and thicken the sauce gently as it cooks without boiling.

The step that matters

Stirring in the egg yolks without boiling. Egg yolks contain proteins that set and curdle when overheated, so the sauce must be cooked gently to stay smooth and thick.

Swap the parsley

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

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

Fit is the average pairing score against fish, butter, flour, mushroom, 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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