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Onion Soup

A broth made from bones, water, spices, and onions, served with fried bread.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 10 ingredients
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Why it works: Clove and pepper match in chemistry and in kitchens. They rank in the top 5% of all ingredient pairs, and cooks put them together in 17,451 recipes. Both carry ethyl octanoate, which smells fruity, wine. The science ↓

Onion Soup

Ingredients

Directions

Make the broth

  1. Boil bones in water with cloves, peppercorns, and hay-leaves for 4 hours.

  2. Strain the broth and return it to the pot.

Finish and serve

  1. Add onions and boil until soft enough to pulp through a sieve.

  2. Stir in butter, salt, and Nepaul pepper to taste.

  3. Serve with fried bread.

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. Clove + peppertop 5% of all pairs
    Smell alikestrong
    Cooked together17,451 recipes

    Shared aroma: ethyl octanoate (fruity, wine).

  2. Butter + breadtop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

    Shared aroma: delta-decalactone (sweet, creamy).

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

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

  4. Clove + oniontop 13% of all pairs
    Smell alikemoderate
    Cooked together16,901 recipes

    Shared aroma: 2-nonanone (fruity, floral).

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

    Shared aroma: decanal (soap, orange peel).

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

What each ingredient does

Bones
Release gelatin and flavour into the water, giving the broth body.
Onions
Soften and pulp to thicken the soup and add sweetness and aroma.
Butter
Adds fat and richness, rounding out the broth's flavour.

Swap the onion

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

  1. Capsicumfits better
  2. Shallotfits better
  3. Carrotfits better
  4. Onionthe original

Fit is the average pairing score against clove, butter, pepper, bread. 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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