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Boiled Onions

A simple dish of onions boiled in salted water, finished with cream or milk, butter, salt, and pepper.

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

Boiled Onions

Ingredients

Directions

Prepare

  1. Remove the skins from the onions under cold water and drain.

Cook

  1. Place the onions in a saucepan and cover with boiling water.

  2. Bring to a boil and cook briskly for five minutes.

  3. Drain and cover the onions again with boiling salted water.

  4. Cook until tender but not broken, then drain.

Finish and serve

  1. Add thin cream or milk and simmer for five minutes.

  2. Stir in butter, salt, and pepper before serving.

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. Cream + buttertop 8% of all pairs
    Smell alikemoderate
    Cooked together41,516 recipes

    Shared aroma: delta-dodecalactone (sweet, creamy).

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

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

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

    Shared aroma: decanal (soap, orange peel).

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

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

  5. Butter + peppertop 21% of all pairs
    Smell alikemoderate
    Cooked together85,593 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

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
Form the dish itself, becoming tender and sweet as they cook through.
Thin cream or milk
Adds moisture and a mild richness that softens the onions' sharpness.
Butter
Adds fat for richness and a smooth, glossy finish to the sauce.

The step that matters

Cook until tender but not broken, then drain.. Boiling too hard or too long makes the onion layers break apart and turn mushy. Testing for tenderness with a knife keeps them whole while still soft through the centre.

Swap the onion

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

  1. Potatofits better
  2. Spinachfits about as well
  3. Capsicumfits about as well
  4. Onionthe original

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