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Cream of Onion Soup

A creamy soup made from sliced onions, butter, milk, water, sugar, salt, pepper, cream, and chopped hard‑boiled eggs.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 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 ↓

Cream of Onion Soup

Ingredients

Directions

Cook the soup

  1. Fry the sliced onions in butter until light brown.

  2. Add milk, water, sugar, salt, and pepper; cook for 30 minutes.

Finish and serve

  1. Strain the mixture and stir in the cream and chopped eggs.

  2. Serve immediately.

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. Butter + creamtop 8% of all pairs
    Smell alikemoderate
    Cooked together41,516 recipes

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

  3. Sugar + creamtop 9% of all pairs
    Smell alikemoderate
    Cooked together43,450 recipes

    Shared aroma: 2,3-butanedione (butter, sweet).

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

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

  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

Onions
Provide the main flavour and sweetness, which develop as they cook down.
Butter
Carries the frying and adds richness and browned, savoury flavour to the onions.
Milk
Forms the liquid base and gives the soup its body and mild creaminess.
Cream
Adds richness and a smooth, silky mouthfeel to the finished soup.
Eggs
Add soft, chopped texture and a little extra richness to the soup.

The step that matters

Frying the onions until light brown. Browning the onions in butter builds deep flavour through caramelisation and the Maillard reaction. Stopping at light brown keeps the sweetness without bitterness from scorching.

Swap the onion

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

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

Fit is the average pairing score against butter, milk, sugar, pepper, cream, egg. 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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