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Boiled Onions

A dish of onions simmered in water, milk, and butter, then seasoned with salt and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Milk and butter 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 to the smooth, silvery skins.

  2. Boil the onions in salted water for about 40 minutes until tender.

Finish with milk

  1. Drain the onions, then return them to the pot with 1 cup boiling water and ½ cup warm milk, and simmer gently for 10 minutes.

  2. Heat ½ cup milk with 2 tablespoons butter in a saucepan until warm.

  3. Drain the onions again, transfer them to a heated dish, and season lightly with salt and pepper.

  4. Pour the warm milk and butter mixture over the onions.

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

    Shared aroma: decanal (soap, orange peel).

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

    Shared aroma: hexanal (green, grassy).

  5. Butter + peppertop 21% of all pairs
    Smell alikemoderate
    Cooked together85,593 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

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

What each ingredient does

Onions
Become tender and mildly sweet as they cook, forming the body of the dish.
Milk
Adds moisture and a soft, creamy texture to the onions.
Butter
Adds fat for richness and a smooth, buttery flavour.

The step that matters

Simmer the onions gently in the milk. Gentle heat keeps the milk from scorching, sticking, or curdling. Vigorous boiling can break down milk proteins and leave the sauce grainy or burnt on the bottom of the pot.

Swap the onion

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

  1. Potatofits better
  2. Capsicumfits better
  3. Tomatofits about as well
  4. Onionthe original

Fit is the average pairing score against milk, butter, 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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