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Sauce

Cream Onion Sauce

A sauce made by stewing onions in milk, then mashing and seasoning with salt, white pepper, and butter.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Milk and butter 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 ↓

Cream Onion Sauce

Ingredients

Directions

Make the onions

  1. Peel and slice the onions.

  2. Place them in a saucepan and cover with milk.

  3. Stew the onions until tender.

  4. Mash the tender onions with a fork.

Finish the sauce

  1. Season with salt and white pepper.

  2. Add enough milk to achieve a creamy sauce consistency.

  3. Stir in the butter and mix well.

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. Milk + buttertop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

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

  2. Sauce + buttertop 15% of all pairs
    Smell alikelow
    Cooked together15,338 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

    Shared aroma: decanal (soap, orange peel).

  4. Onion + saucetop 19% of all pairs
    Smell alikelow
    Cooked together10,474 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

    Shared aroma: hexanal (green, grassy).

Sauce and butter barely smell alike, yet cooks put them together in 15,338 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 main body and sweet flavour of the sauce once softened and mashed.
Milk
Softens the onions as they stew and loosens the mash into a creamy sauce.
Butter
Adds richness and a smooth, silky mouthfeel to the finished sauce.

The step that matters

Stew the onions until tender. Onions that are under-cooked stay firm and sharp and will not mash into a smooth sauce. Cooking them gently in milk until fully soft lets their starches and sugars break down, giving a mellow, sweet base.

Swap the white pepper

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

  1. Capersfits better
  2. Garlicfits better
  3. Parsleyfits better
  4. White pepperthe original

Fit is the average pairing score against onion, milk, sauce, butter. 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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