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Sauce

Clarified Butter and Brown Sauce

A brown sauce made by clarifying butter, adding flour, and cooking with onion.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 3 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 ↓

Clarified Butter and Brown Sauce

Ingredients

Directions

Make the roux

  1. Melt the butter in a saucepan without boiling it.

  2. Skim off the frothy top.

  3. Pour the clarified butter back into the pan, leaving the milky sediment behind.

  4. Gradually mix in the flour until it forms a pudding‑like consistency that does not stick to the pan.

  5. Keep stirring over low heat until the mixture turns light brown, resembling the color of pie crust.

Finish and store

  1. Remove from heat.

  2. Add the onion slices to impart flavor and reduce heat.

  3. Continue stirring until bubbling ceases.

  4. Pour the sauce into small jars for storage.

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. Butter + oniontop 15% of all pairs
    Smell alikemoderate
    Cooked together42,912 recipes

    Shared aroma: decanal (soap, orange peel).

  3. Flour + oniontop 17% of all pairs
    Smell alikemoderate
    Cooked together32,460 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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
Clarified, it carries fat and flavor and cooks the flour without milk solids scorching.
All-purpose flour
Forms the roux that thickens the sauce as it cooks and browns.
Onion
Adds aromatic flavor to the sauce while it sits in the hot roux.

The step that matters

Keep stirring over low heat until light brown. Flour thickens on its own, but browning develops nutty flavor and color. Low heat and constant stirring prevent scorching, since burnt starch tastes bitter and cannot be rescued.

Swap the onion

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

  1. Shallotfits better
  2. Leekfits better
  3. Arrowrootfits better
  4. Onionthe original

Fit is the average pairing score against butter, flour. 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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