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Boiled Onions

A simple dish of onions boiled until tender, then seasoned with butter, salt, 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. Cut off the tops and peel the onions.

  2. Soak the onions in cold water for 30 minutes.

Boil

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

  2. Cook for 15 minutes, then drain the water.

  3. Cover the onions again with boiling water and boil until a straw can pierce them.

Finish

  1. Drain the water and add butter, coarse sea salt, and pepper to taste.

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
Are the main ingredient, becoming soft and sweet as they cook through in boiling water.
Butter
Adds richness and a silky mouthfeel to the cooked onions.

The step that matters

Boil until a straw can pierce the onions. Onions need to be cooked through to become tender and sweet. Stopping early leaves them firm and sharp, while the straw test checks doneness better than a fixed time, since onion size and density vary.

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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