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Sauce

Another Brown Onion Sauce

A sauce made with onions, butter, and flour.

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 ↓

Another Brown Onion Sauce

Ingredients

Directions

  1. Melt the butter in a pan over medium heat.

  2. Add the minced onions and cook until they are well colored.

  3. Stir in the flour and cook for a few more minutes, stirring constantly.

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. Onion + buttertop 15% of all pairs
    Smell alikemoderate
    Cooked together42,912 recipes

    Shared aroma: decanal (soap, orange peel).

  3. Onion + flourtop 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

Onions
Caramelized onions provide the deep brown color and sweet, savory flavor of the sauce.
Butter
Fat that carries flavor, cooks the onions and adds richness to the sauce.
Flour
Starch that thickens the sauce as it cooks with the butter and onion juices.

The step that matters

Browning the onions. Onions need enough time over heat for their sugars to caramelize and turn brown. Stopping early leaves a pale, less flavorful sauce, while pushing too hard can scorch them and make the sauce bitter.

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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