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Boiled Onions

Boiled onions are cooked in salted, sugared water and finished with butter.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Onion and butter are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 42,912 recipes. Both carry decanal, which smells soap, orange peel. The science ↓

Boiled Onions

Ingredients

Directions

Prepare

  1. Remove the skins from the onions while holding them under water to avoid eye irritation.

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

Boil

  1. Add 1 teaspoon of salt and 1 teaspoon of sugar to the water.

  2. Boil slowly for about 30 minutes or until the onions are tender.

Finish

  1. Drain the onions thoroughly.

  2. Add a little butter, then bring to a boil.

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

    Shared aroma: decanal (soap, orange peel).

  2. Sugar + buttertop 17% of all pairs
    Smell alikemoderate
    Cooked together98,233 recipes

    Shared aroma: guaiacol (smoky, sweet).

  3. Onion + sugartop 36% of all pairs
    Smell alikelow
    Cooked together15,747 recipes

    Shared aroma: guaiacol (smoky, sweet).

Onion and sugar barely smell alike, yet cooks put them together in 15,747 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, which softens and turns tender as they simmer in water.
Butter
Adds richness and a silky coating that carries flavor across the onions.
Sugar
Adds gentle sweetness that rounds out the mild flavor of the cooked onions.

The step that matters

Boil slowly for about 30 minutes. A hard, rapid boil can break the onions apart and cook them unevenly. A gentle simmer lets them soften through to the center while keeping their shape.

Swap the onion

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

  1. Sweet potatofits better
  2. Leekfits better
  3. Potatofits better
  4. Onionthe original

Fit is the average pairing score against sugar, 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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