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White Onion Sauce

A creamy sauce made from boiled onions, butter, flour, salt, and cream or milk.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Butter and cream are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 41,516 recipes. Both carry delta-dodecalactone, which smells sweet, creamy. The science ↓

White Onion Sauce

Ingredients

Directions

Prepare the onions

  1. Peel and halve the onions, then soak them in spring water for 15 minutes.

  2. Boil the onions in fresh water for 45 minutes or until tender, draining well afterward.

  3. Chop and bruise the onions on a cutting board.

Make the sauce

  1. In a clean saucepan, combine the chopped onions with butter, flour, and salt.

  2. Stir in cream or milk and cook until it boils.

  3. Rub the mixture through a sieve, adding more cream or milk to achieve your desired consistency.

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 + creamtop 8% of all pairs
    Smell alikemoderate
    Cooked together41,516 recipes

    Shared aroma: delta-dodecalactone (sweet, creamy).

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

    Shared aroma: isobutyraldehyde (malty, green).

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

    Shared aroma: decanal (soap, orange peel).

  4. Onion + flourtop 17% of all pairs
    Smell alikemoderate
    Cooked together32,460 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Onion + creamtop 18% of all pairs
    Smell alikelow
    Cooked together10,827 recipes

    Shared aroma: 2-nonanone (fruity, floral).

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

White onions
Provide the bulk of the sauce and its sweet, mellow flavour once cooked and puréed.
Butter
Adds fat and richness, carrying flavour and giving the sauce a smooth mouthfeel.
Flour
Thickens the sauce by absorbing liquid and gelatinising when heated with the fat and cream.
Cream or milk
Supplies liquid and fat that turn the onion mixture into a creamy, pourable sauce.

The step that matters

Rub the mixture through a sieve. Pushing the cooked onions through a sieve breaks down fibres and removes lumps, giving a smooth sauce. Adding cream or milk afterward lets you adjust thickness, since the starch set during cooking stiffens as it cools.

Swap the onion

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

  1. Leekfits better
  2. Arrowrootfits better
  3. Chivefits better
  4. Onionthe original

Fit is the average pairing score against butter, flour, cream. 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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