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Boiled Onions

Boiled onions simmered in salted water with butter and milk.

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

Prepare and boil

  1. Peel the onions.

  2. Place them in a pot with cold water.

  3. Bring to a boil and cook for 20 minutes.

  4. Drain the water.

  5. Add more boiling water and enough salt to season.

  6. When tender, drain the water again.

Finish

  1. Add butter and a little milk.

  2. Boil slowly for a few minutes.

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

    Shared aroma: decanal (soap, orange peel).

  3. Butter + walnuttop 15% of all pairs
    Smell alikemoderate
    Cooked together6,832 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

  4. Onion + walnuttop 15% of all pairs
    Smell alikemoderate
    Cooked together1,771 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  5. Walnut + milktop 16% of all pairs
    Smell alikemoderate
    Cooked together3,236 recipes

    Shared aroma: 1-hexanal (fruit).

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

What each ingredient does

Onions
Form the dish's main body and soften into a tender, sweet vegetable as they cook.
Butter
Adds richness and a smooth, fatty mouthfeel to the finished onions.
Milk
Adds moisture and creaminess to the finished onions.

The step that matters

When tender, drain the water again. Onions left in too much cooking water become waterlogged and dilute their flavor. Draining fully before adding butter and milk keeps the finish rich and concentrated.

Swap the onion

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

  1. Potatofits better
  2. Capsicumfits better
  3. Sweet potatofits better
  4. Onionthe original

Fit is the average pairing score against butter, walnut, milk. 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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