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Bkown Onion Sauce

A savory sauce made from sautéed onions, peppercorns, butter, espagnole and plain sauces, finished with lemon juice.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Butter and sauce 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 ↓

Bkown Onion Sauce

Ingredients

Directions

  1. Slice the onions and place them in a saucepan with peppercorns, salt, and butter.

  2. Stir until the onions are light brown.

  3. Add a ladleful of espagnole sauce.

  4. Reduce the sauce.

  5. Stir in half as much plain sauce.

  6. Bring the sauce to a boil.

  7. Rub the mixture through a fine sieve into a clean saucepan.

  8. Heat the sauce.

  9. Squeeze in the juice of half a lemon before serving.

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 + saucetop 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. Butter + lemontop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

    Shared aroma: 3-hexenal (apple, fruity).

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

    Shared aroma: ethanol (alcoholic, ethereal).

  5. Onion + lemontop 19% of all pairs
    Smell alikemoderate
    Cooked together15,646 recipes

    Shared aroma: decanal (soap, orange peel).

Butter and sauce 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
Browned and strained, they give the sauce its main flavour and body.
Espagnole sauce
Provides the rich, savoury brown base that the onions are built into.
Butter
Fat that helps the onions brown gently and carries their flavour.
Plain sauce
Added in smaller amount to thin and mellow the sauce's body.
Lemon juice
Adds acidity that brightens the rich, savoury sauce just before serving.

The step that matters

Stir until the onions are light brown. Onions colour through the Maillard reaction and caramelisation, which build savoury depth. Pale onions taste raw and flat, while over-browned ones turn bitter, so stir steadily and watch the colour.

Swap the lemon

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

  1. Avocadofits better
  2. Coconutfits better
  3. Mangofits better
  4. Lemonthe original

Fit is the average pairing score against onion, butter, sauce. 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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