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Sauce

Brown Onion Sauce for Gravy

A brown onion sauce made with butter, onions, flour, stock, pepper, salt, port wine, mushroom catsup, and optional lemon juice or vinegar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 ingredients
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Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Brown Onion Sauce for Gravy

Ingredients

Directions

  1. Heat the butter in a pan until free of water.

  2. Fry the sliced onions in the butter until light brown.

  3. Gradually stir in the flour.

  4. Add a little stock, pepper, and salt; boil for a few minutes.

  5. Strain the mixture through a sieve.

  6. Stir in the port wine and mushroom catsup.

  7. Add lemon juice or vinegar for a sharper flavor, if desired.

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. Pepper + lemontop 3% of all pairs
    Smell alikestrong
    Cooked together27,047 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  2. Butter + mushroomtop 7% of all pairs
    Smell alikemoderate
    Cooked together12,525 recipes

    Shared aroma: trans-2-decenal (waxy, orange).

  3. Onion + mushroomtop 10% of all pairs
    Smell alikemoderate
    Cooked together10,626 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  4. Port wine + mushroomtop 10% of all pairs
    Smell alikemoderate
    Cooked together570 recipes

    Shared aroma: guaiacol (smoky, sweet).

  5. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Butter
Carries the onion flavor and enriches the sauce with fat for a smooth mouthfeel.
Onions
Browning in the butter builds sweetness and a deep, savoury flavor for the sauce.
Flour
Thickens the sauce as it cooks with the stock, giving it body.
Port wine
Adds depth and a rich, fruity sweetness to the finished sauce.
Mushroom catsup
Adds savoury, umami depth to the sauce.

The step that matters

Fry the onions until light brown. Onions cooked slowly in butter caramelise and develop sweetness and colour. Stopping too early leaves a raw, sharp taste, while over-browning turns the sauce bitter.

Swap the lemon

The recipe marks lemon as optional. How well each one fits the dish's main ingredients (butter, onion, flour, pepper, port wine, mushroom):

  1. Plumfits better
  2. Figfits better
  3. Cherryfits about as well
  4. Lemonthe original

Fit is the average pairing score against butter, onion, flour, pepper, port wine, mushroom. 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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