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Onion Soup

A simple soup made with onions, butter, milk, rice flour, and parsley.

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 ↓

Onion Soup

Ingredients

Directions

Make the soup

  1. Melt the butter in a pan.

  2. Add the sliced onion and simmer until cooked.

  3. Stir in the milk and rice flour to thicken the soup.

  4. Add the minced parsley.

Serve

  1. Transfer to a tureen and season to taste.

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. Milk + ricetop 7% of all pairs
    Smell alikemoderate
    Cooked together7,374 recipes

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

  3. Onion + parsleytop 9% of all pairs
    Smell alikemoderate
    Cooked together25,843 recipes

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

  4. Onion + ricetop 9% of all pairs
    Smell alikemoderate
    Cooked together10,433 recipes

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

  5. Parsley + ricetop 10% of all pairs
    Smell alikestrong
    Cooked together2,762 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

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

What each ingredient does

Butter
Adds fat and richness, carrying flavour through the soup.
Onion
Softens as it cooks, adding aroma and mild sweetness to the soup.
Milk
Adds liquid and creamy body to the soup.
Rice flour
Its starch swells in the hot liquid and thickens the soup.

The step that matters

Stir in the milk and rice flour to thicken the soup.. Starch must be evenly dispersed in the hot liquid to thicken smoothly. Added unmixed, rice flour clumps into lumps that are hard to remove, so stir steadily as you add it.

Swap the onion

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

  1. Potatofits better
  2. Shallotfits better
  3. Leekfits better
  4. Onionthe original

Fit is the average pairing score against parsley, butter, milk, rice, flour. 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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