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Sauce

Brown Onion Sauce

A savory sauce made from onions, butter, sugar, flour, beef gravy, and seasoned with cayenne or black pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Onion and beef are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 17,092 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Brown Onion Sauce

Ingredients

Directions

  1. In a skillet, melt the butter over medium heat.

  2. Add the sliced onions and sugar; fry until the onions are nicely browned.

  3. Stir in the flour or brown roux to thicken the mixture.

  4. Pour in the beef gravy and stir until you have a thick sauce.

  5. Season with cayenne or black pepper to taste.

  6. Rub the sauce through a sieve for a smooth texture.

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 + beeftop 7% of all pairs
    Smell alikemoderate
    Cooked together17,092 recipes

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

  2. Beef + peppertop 10% of all pairs
    Smell alikemoderate
    Cooked together18,971 recipes

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

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

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

  4. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Sugar + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

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
Browning slowly with sugar gives the sauce its deep, sweet, savoury flavour.
Flour or brown roux
Thickens the sauce so it clings to food.
Beef gravy
Provides the liquid base and meaty flavour of the sauce.
Butter
Carries the onions as they fry and adds richness.

The step that matters

Browning the onions. Onions need enough time over medium heat to brown deeply. Pale onions give a flat, less sweet sauce, while the sugar helps the sugars caramelise for colour and flavour.

Swap the onion

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

  1. Capsicumfits better
  2. Potatofits better
  3. Chivefits better
  4. Onionthe original

Fit is the average pairing score against butter, sugar, flour, beef, 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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