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Walnut Sauce

A sauce made from a flour‑butter roux, thickened with hot water, seasoned with lemon juice, pepper, salt, and finished with butter and pickled walnuts.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Lemon and pepper match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Walnut Sauce

Ingredients

Directions

Make the sauce

  1. In a saucepan, rub together equal parts flour and butter to make a roux.

  2. When hot, slowly incorporate enough hot water to form a smooth sauce.

  3. Season with lemon juice, pepper, and coarse sea salt.

Finish

  1. Strain the sauce, then beat in a lump of butter.

  2. Add several sliced pickled walnuts.

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. Lemon + peppertop 3% of all pairs
    Smell alikestrong
    Cooked together27,047 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  2. Lemon + walnuttop 10% of all pairs
    Smell alikestrong
    Cooked together2,149 recipes

    Shared aroma: 2-nonenal (fatty, green).

  3. Flour + buttertop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Flour + walnuttop 12% of all pairs
    Smell alikemoderate
    Cooked together5,873 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Pepper + walnuttop 13% of all pairs
    Smell alikemoderate
    Cooked together3,039 recipes

    Shared aroma: 2-nonenal (fatty, green).

Flour and butter 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

Flour
Thickens the sauce as a roux, giving it body and a smooth, stable texture.
Butter
Adds richness and a smooth, glossy mouthfeel to the sauce.
Lemon juice
Adds acidity that brightens the sauce and balances its richness.
Pickled walnuts
Add a tangy, savoury flavour and chunky texture to the sauce.

The step that matters

Adding the hot water to the roux. Liquid added slowly to a hot flour-and-fat roux, while stirring, lets the starch disperse evenly and swell without clumping. Adding it all at once often leaves lumps that are hard to smooth out.

Swap the walnut

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

  1. Almondfits better
  2. Chickpeafits better
  3. Pistachiofits better
  4. Walnutthe original

Fit is the average pairing score against flour, butter, lemon, 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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