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Pickled Onions

Pickled onions are small white onions preserved in a spiced vinegar solution.

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

Pickled Onions

Ingredients

Directions

Prepare

  1. Peel the small white onions.

  2. Boil equal parts vinegar and water for 10 minutes.

  3. Drain the onions and place them in bottles.

Pickle

  1. Boil spiced vinegar with red peppers and mixed spices.

  2. Pour the boiling spiced vinegar over the onions in the bottles.

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 + vinegartop 14% of all pairs
    Smell alikemoderate
    Cooked together18,226 recipes

    Shared aroma: acetic acid (sour, vinegar).

  3. Vinegar + peppertop 14% of all pairs
    Smell alikemoderate
    Cooked together27,814 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Small white onions
Provide the main vegetable that becomes crisp-tender and tangy as it pickles.
Vinegar
Acidity that preserves the onions and gives the pickle its sharp flavour.
Red peppers
Add gentle heat and colour to the spiced vinegar.
Mixed spices
Add aroma and warm flavour to the spiced vinegar.

The step that matters

Pouring the boiling spiced vinegar over the onions. The hot liquid softens the onions slightly and helps the flavours penetrate, while the vinegar's acidity keeps the pickle stable. Pouring it while it is boiling ensures it is hot enough to work through the onions.

Swap the onion

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

  1. Capsicumfits better
  2. Mustardfits better
  3. Cabbagefits better
  4. Onionthe original

Fit is the average pairing score against vinegar, 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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