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Boiled Onions

A simple dish of boiled onions seasoned with butter, cream, salt, and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 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 ↓

Boiled Onions

Oven, in the book's wordsA quick oven

Ingredients

Directions

Prepare

  1. Wash the onions well.

  2. Peel the onions.

  3. If large, cut the onions in half.

Boil and season

  1. Boil the onions in several waters, draining well each time.

  2. Once cooked, add butter, cream or rich milk, salt, and pepper for seasoning.

  3. Cook for a few minutes after adding the seasoning.

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 + 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; boiling in several waters softens them and mellows their sharp flavour.
Butter
Adds richness and fat, giving the onions a smooth, rounded mouthfeel.
Cream or rich milk
Adds fat and body, making a creamy sauce that coats the onions.

The step that matters

Draining well after each boil. Changing the water removes sulphur compounds and bitterness from the onions. Incomplete draining leaves excess water that dilutes the butter and cream, so the finished dish turns watery and loses flavour.

Swap the onion

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

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

Fit is the average pairing score against butter, cream, 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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