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Boiled Onions

A dish of boiled onions served with a butter‑flour sauce.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Boiled Onions

Ingredients

Directions

Boil the onions

  1. Peel and boil the onions in boiling salted water for 35 to 40 minutes.

  2. Remove the onions with a skimmer and drain them.

Make the sauce

  1. In a bowl, stir the butter to a cream, then add the flour and salt.

  2. Slowly mix in the boiling milk, stirring constantly until smooth.

  3. Cook the sauce for a few minutes until thickened.

Serve

  1. Serve the onions with the sauce or with a simple dressing of salt, pepper, and a small lump of butter in each onion.

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. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

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

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

  3. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Flour + milktop 14% of all pairs
    Smell alikelow
    Cooked together78,219 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

    Shared aroma: decanal (soap, orange peel).

Butter and flour barely smell alike, yet cooks put them together in 124,287 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

White onions
Form the main body of the dish, becoming soft and sweet as they cook in water.
Butter
Enriches the sauce with fat, adding richness and a smooth mouthfeel.
Flour
Thickens the milk into a smooth sauce as its starch swells when heated.
Milk
Forms the liquid base of the sauce, giving it creaminess and body.

The step that matters

Stirring the boiling milk into the flour and butter. Adding hot liquid quickly and stirring constantly keeps the flour dispersed, preventing lumps and giving a smooth sauce as the starch thickens.

Swap the onion

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

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

Fit is the average pairing score against butter, flour, milk, 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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