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Onions, Plain Boiled

Boiled onions served plain, optionally with milk and butter.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 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 ↓

Onions, Plain Boiled

Ingredients

Directions

Prepare

  1. Hold onions under water while peeling to avoid eye irritation.

  2. Cut the onions in half across the grain.

Cook and serve

  1. Place the onions in a pot with cold water and boil until tender, allowing the water to evaporate.

  2. If desired, add milk and boil until it evaporates.

  3. Season with butter before serving.

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

    Shared aroma: hexanal (green, grassy).

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

What each ingredient does

Onions
Provide the main body and sweetness that develop as they soften during boiling.
Butter
Adds fat and richness, coating the cooked onions with flavor.
Milk
Adds creaminess and mild sweetness as its milk solids reduce during boiling.

The step that matters

Boil until the water evaporates. Letting the water boil off concentrates the onions' flavor and keeps them from tasting watery. Stopping too early leaves them diluted, while cooking too long can make them mushy.

Swap the onion

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

  1. Potatofits better
  2. Asparagusfits about as well
  3. Leekfits about as well
  4. Onionthe original

Fit is the average pairing score against butter, 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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