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Sauce

White Onion Sauce

A sauce made from boiled and mashed white onions, butter, milk, and salt.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

White Onion Sauce

Ingredients

Directions

Prepare the onions

  1. Peel and halve the onions.

  2. Soak them in water for 30 minutes.

  3. Boil the onions until tender, then drain.

  4. Chop and pound the onions finely.

Make the sauce

  1. In a saucepan, combine the onions, butter, salt, and ½ cup of milk.

  2. Cook over medium heat, stirring until it boils.

  3. Pass the mixture through a sieve.

  4. Add more milk to achieve the 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 + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

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

    Shared aroma: decanal (soap, orange peel).

  3. Onion + milktop 20% of all pairs
    Smell alikemoderate
    Cooked together13,418 recipes

    Shared aroma: hexanal (green, grassy).

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

What each ingredient does

White patna onions
Form the body of the sauce once cooked, softened, and pounded into a smooth base.
Butter
Adds fat and richness, giving the sauce a smoother mouthfeel and rounder flavour.
Milk
Thins the onion purée and sets the final consistency of the sauce.

The step that matters

Cook over medium heat, stirring until it boils. Onion sugars and starches can scorch on the bottom of the pan if left unstirred, giving a bitter, burnt taste. Steady stirring keeps the mixture even and smooth, and the milk can curdle or separate if it is overheated.

Swap the onion

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

  1. Potatofits better
  2. Asparagusfits about as well
  3. Leekfits about as well
  4. Onionthe original

Fit is the average pairing score against butter, milk. 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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