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Sauce

Onion Sauce, Brown

A brown onion sauce made by frying onions with butter, adding gravy, simmering, skimming fat, seasoning, sieving, and reheating.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Onion Sauce, Brown

Ingredients

Directions

Prepare the onions

  1. Slice the onions.

  2. Fry the sliced onions in a stewpan with butter until pale brown, stirring well to prevent burning.

Simmer the sauce

  1. Pour the gravy over the onions.

  2. Let the onions simmer gently until tender.

  3. Skim off any fat.

  4. Add salt and pepper.

  5. Rub the mixture through a sieve.

Finish and serve

  1. Return the sauce to the saucepan to warm.

  2. Serve when it boils.

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

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

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

    Shared aroma: decanal (soap, orange peel).

  3. Butter + peppertop 21% of all pairs
    Smell alikemoderate
    Cooked together85,593 recipes

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

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

What each ingredient does

Onions
Sweetness and body; they soften and break down into the sauce as it simmers.
Butter
Fat that carries the frying and helps the onions brown gently for flavour.
Good gravy
Liquid base that gives the sauce its savoury depth and pourable consistency.

The step that matters

Frying the onions until pale brown. Stirring well keeps the onions from scorching, since burnt sugars turn bitter and dark. Pale brown gives gentle sweetness without a harsh taste.

Swap the onion

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

  1. Capsicumfits better
  2. Potatofits better
  3. Carrotfits about as well
  4. Onionthe original

Fit is the average pairing score against butter, pepper. 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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