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Soup

Onion Soup

A soup made from onions, stale bread crumbs, and hot milk, seasoned with pepper and sea salt.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Bread and milk are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 11,466 recipes. Both carry 2-undecenal, which smells sweet. The science ↓

Onion Soup

Ingredients

Directions

  1. Boil the onion with the stale bread crumbs until the onion is tender.

  2. Rub the mixture through a sieve.

  3. Add the hot milk and season with pepper and coarse sea salt.

  4. Serve hot.

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. Bread + milktop 11% of all pairs
    Smell alikemoderate
    Cooked together11,466 recipes

    Shared aroma: 2-undecenal (sweet).

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

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

  3. Onion + breadtop 15% of all pairs
    Smell alikemoderate
    Cooked together8,676 recipes

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

  4. Bread + peppertop 16% of all pairs
    Smell alikemoderate
    Cooked together20,964 recipes

    Shared aroma: 2-nonenal (fatty, green).

  5. 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

Onion
Softens when boiled and gives the soup its main body and flavour.
Stale bread crumbs
Absorb liquid and thicken the mixture, adding body to the soup.
Milk
Adds creaminess and moisture, loosening the thickened onion mixture into a soup.

The step that matters

Rubbing the mixture through a sieve. Pressing the boiled onion and bread through a sieve breaks down the soft solids into a smooth texture. Skipping or rushing this leaves lumps and fibres in the soup.

Swap the onion

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

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

Fit is the average pairing score against bread, 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.

More onion soup recipes

French 31Brown 15with Milk 7White 5Bavarian 4Bermuda 4 See all 236 →

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