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Sauce

Onion Sauce

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

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 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 ↓

Onion Sauce

Ingredients

Directions

Prepare the onions

  1. Boil the onions in water until tender, changing the water twice.

  2. Drain the onions in a colander.

  3. Pass the drained onions through the colander with a wooden spoon.

Make the sauce

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

  2. Stir until the mixture reaches a good thickness.

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

    Shared aroma: decanal (soap, orange peel).

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

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

Onion and cream barely smell alike, yet cooks put them together in 10,827 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
Provide the bulk and mild sweetness of the sauce once boiled and pureed.
Butter
Adds fat and rich flavour that carries through the smooth sauce.
Cream
Adds moisture and richness, helping the sauce become smooth and velvety.

The step that matters

Stir until the mixture reaches a good thickness. Heating the onion purée with cream thickens it gradually as its moisture evaporates and its starches and proteins set. Stirring keeps heat even so the sauce does not scorch on the base of the pan.

Swap the onion

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

  1. Potatofits about as well
  2. Onionthe original
  3. Leekfits about as well
  4. Chivefits less well

Fit is the average pairing score against butter, 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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