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French Thickening ; Or, Brown Roux

A brown roux made by cooking butter and flour together to thicken soups or gravies.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 2 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 ↓

French Thickening ; Or, Brown Roux

Ingredients

Directions

Make the roux

  1. Melt the butter over low heat and skim off any impurities.

  2. Let the butter settle, then pour it into a clean frying pan.

  3. Gradually add the flour to the butter, shaking the pan often.

  4. Stir constantly until the mixture turns a clear light brown color.

Store and use

  1. Store in a jar and stir a spoonful into boiling soup or gravy as needed.

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).

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
Carries the flour and adds rich flavor, while its milk solids help the roux brown.
Flour
Thickens liquids through its starch and deepens in flavor and color as it cooks in the fat.

The step that matters

Stir constantly until light brown. Flour scorches quickly on the pan bottom, and constant stirring keeps the color even. As a roux darkens, its thickening power weakens, so the color is a balance between flavor and thickening.

“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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