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Boiled Onions

A dish of onions boiled in salted water and seasoned with butter or dripping and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Boiled Onions

Ingredients

Directions

Prepare

  1. Select onions of uniform size.

  2. Peel the onions and soak them in cold salt water for 15 minutes.

Boil and season

  1. Place the onions in a pot of boiling salt water, ensuring they are fully covered.

  2. Cover the pot and boil gently until a straw can pierce the onions.

  3. Drain the onions and season with butter or dripping, pepper, and salt.

  4. To reduce the strength, boil the onions in two or more waters.

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

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

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

    Shared aroma: decanal (soap, orange peel).

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

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

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; they soften and turn tender as they boil.
Butter or dripping
Adds fat and richness, carrying flavour over the cooked onions.

The step that matters

Boil gently until a straw can pierce the onions. Gentle simmering cooks the onions through evenly without breaking them apart. Boiling too hard can make the outer layers fall apart before the centre is tender, so testing with a straw confirms doneness throughout.

Swap the onion

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

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

Fit is the average pairing score against 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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