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Onion Sauce

A savory sauce made from sautéed onions, butter, beef gravy, cayenne pepper, salt, lemon juice, and optional sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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 ↓

Onion Sauce

Ingredients

Directions

Prepare and brown the onions

  1. Peel and slice the onions.

  2. In a stewpan, melt the butter and add the onions.

  3. Stir over medium heat until the onions are light brown.

Make the sauce

  1. Dust the onions with flour, then add the beef gravy, cayenne pepper, and salt.

  2. Simmer until the sauce thickens, then strain through a colander if desired.

Finish

  1. Just before serving, squeeze in the lemon juice.

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

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

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

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

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

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

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

    Shared aroma: decanal (soap, orange peel).

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

What each ingredient does

Onions
Browning develops sweetness and deep flavor, and softened onions give the sauce body.
Butter
Fat that carries flavor and adds richness while the onions cook.
Beef gravy
Savory liquid base that becomes the sauce as it simmers and thickens.
Lemon juice
Acidity that brightens the rich, savory sauce.

The step that matters

Browning the onions. Onions need slow, even browning over medium heat. Too much heat scorches the sugars and makes a bitter taste, while too little leaves them pale and flat in flavor.

Swap the onion

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

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

Fit is the average pairing score against butter, beef, pepper, lemon, sugar. 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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