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Sauce

Brown Onion Sauce

A sauce made from softened onions simmered with Espagnole sauce and butter.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 3 ingredients
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Why it works: Sauce and butter are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 15,338 recipes. Both carry ethanol, which smells alcoholic, ethereal. The science ↓

Brown Onion Sauce

Ingredients

Directions

Prepare the onions

  1. Prepare the onions by cooking them until soft, then drain off the butter.

Make the sauce

  1. Add the Espagnole sauce and let it cook for 10 minutes.

Quicker method

  1. For a quicker version, lightly toss the onions in butter until browned.

  2. Drain off the butter, add the sauce, and let it simmer for 15 minutes.

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. Sauce + buttertop 15% of all pairs
    Smell alikelow
    Cooked together15,338 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

    Shared aroma: decanal (soap, orange peel).

  3. Onion + saucetop 19% of all pairs
    Smell alikelow
    Cooked together10,474 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

Sauce and butter barely smell alike, yet cooks put them together in 15,338 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
Provide the main body and sweetness as they soften and brown.
Espagnole sauce
Adds savoury depth and body, thickening the sauce as it simmers.
Butter
Carries flavour and helps the onions brown in the pan.

The step that matters

Browning the onions in butter. Browning develops sweet, deep flavour through Maillard reactions and caramelisation. Too little heat leaves the onions pale and steamed, while too much heat burns them and makes the sauce bitter.

Swap the onion

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

  1. Shallotfits better
  2. Mustardfits about as well
  3. Onionthe original
  4. Tomatofits about as well

Fit is the average pairing score against sauce, butter. 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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