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Onion Sauce

A sauce made by boiling onions, then simmering with milk, pepper, and pepper sauce, finished with 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 ↓

Onion Sauce

Ingredients

Directions

Prepare the onions

  1. Boil the onions in salted water until tender.

  2. Change the water and drain the onions.

  3. Chop the onions finely.

Make the sauce

  1. Boil the chopped onions with milk, salt, pepper, and pepper sauce.

  2. Stir in the drawn butter and serve.

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. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

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

    Shared aroma: ethanol (alcoholic, ethereal).

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

    Shared aroma: decanal (soap, orange peel).

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

    Shared aroma: ethanol (alcoholic, ethereal).

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

White onions
Provide the bulk of the sauce and its sweet, mellow flavor as they soften.
Milk
Forms the creamy liquid base that gives the sauce body and smoothness.
Drawn butter
Adds richness and a silky mouthfeel when stirred in at the end.

The step that matters

Boiling the chopped onions in milk. Milk can scorch or curdle if it boils too hard on the bottom of the pan. Keeping the heat gentle and stirring helps the onions soften evenly into a smooth sauce.

Swap the onion

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

  1. Capsicumfits better
  2. Potatofits better
  3. Tomatofits better
  4. Onionthe original

Fit is the average pairing score against milk, pepper, 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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