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Pickled Onions

Pickled onions prepared by boiling in milk and water, then immediately covered with scalding spiced vinegar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Onion and vinegar are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 18,226 recipes. Both carry acetic acid, which smells sour, vinegar. The science ↓

Pickled Onions

Ingredients

Directions

Prepare the onions

  1. Select small white onions.

  2. Boil them in equal portions of milk and water for ten minutes.

Pickle

  1. Drain the onions.

  2. Pour scalding spiced vinegar over the onions immediately.

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

    Shared aroma: acetic acid (sour, vinegar).

  2. Onion + milktop 20% of all pairs
    Smell alikemoderate
    Cooked together13,418 recipes

    Shared aroma: hexanal (green, grassy).

  3. Milk + vinegartop 28% of all pairs
    Smell alikemoderate
    Cooked together2,949 recipes

    Shared aroma: isoamyl acetate (banana, pear).

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

What each ingredient does

Small white onions
Form the main body of the dish, becoming tender and absorbing the vinegar flavour.
Milk
Helps mellow the sharp, raw bite of the onions while they boil.
Spiced vinegar
Adds acidity and sharp flavour that preserves the onions and gives the pickle its tang.

The step that matters

Pour the scalding vinegar immediately after draining. Hot onions are more open to the vinegar, so the liquid penetrates more evenly. If the onions cool first, they absorb less flavour and the pickling is weaker and less even.

Swap the onion

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

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

Fit is the average pairing score against milk, vinegar. 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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