Skip to main content
Sauce

Onion Sauce

A sauce made from boiled onions, butter, cream, flour, and salt, simmered for five minutes.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
Jump to recipe ↓

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 ↓

Onion Sauce

Ingredients

Directions

  1. Rub the boiled onions through a fine sieve.

  2. In a saucepan, combine the sieved onions with butter, cream, flour, and salt.

  3. Stir and stew the mixture for five minutes.

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

Boiled onions
Provide the bulk and main flavour of the sauce once sieved into a smooth purée.
Butter
Adds fat for richness and a smooth, rounded mouthfeel.
Cream
Adds richness and moisture, giving the sauce a silky texture.
Flour
Thickens the sauce as its starch swells and gelatinises when heated with the liquid.

The step that matters

Stirring while the mixture stews. Stirring keeps the flour evenly dispersed so it does not form lumps or scorch on the pan base. Cooking it fully lets the starch swell and thicken the sauce, and removes the raw, floury taste.

Swap the onion

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

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

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

More onion sauce recipes

Brown 49White 27Sage 9Young 8Spanish 5Fried 3 See all 175 →

You might also like

Wine Sauce (for stewed fruit)Wine Sauce (for stewed fruit)186 recipesCaper SauceCaper Sauce180 recipesBrown SauceBrown Sauce141 recipesDutch SauceDutch Sauce74 recipes