Skip to main content
Main

Onion Cream Soup

A creamy soup made from potato, onion, butter, milk, and egg yolk, served with croutons.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
Jump to recipe ↓

Why it works: Potato and onion are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Onion Cream Soup

Ingredients

Directions

Prepare

  1. Peel and slice the potato and onion.

Make the soup

  1. In a pot, brown the potato and onion in the butter.

  2. Add the milk and simmer until tender.

  3. Season with salt and pepper, then strain through a colander.

  4. Return to heat and stir in the beaten egg yolk.

Serve

  1. Serve with croutons.

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. Potato + oniontop 3% of all pairs
    Smell alikemoderate
    Cooked together9,023 recipes

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

  2. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  3. Potato + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together8,305 recipes

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

  4. Potato + milktop 9% of all pairs
    Smell alikemoderate
    Cooked together3,611 recipes

    Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).

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

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

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

What each ingredient does

Potato
Breaks down while simmering to thicken the soup and give it body.
Onion
Browns in butter to add sweetness and savory depth to the soup.
Butter
Carries the browning of the potato and onion and adds richness.
Milk
Forms the liquid base and gives the soup a creamy texture.
Egg yolk
Enriches and thickens the soup when stirred in off the heat.

The step that matters

Stirring in the egg yolk. Egg yolk can curdle or scramble if the soup is too hot. Returning the pot to heat only gently, and stirring constantly, lets the yolk thicken the soup smoothly.

Swap the onion

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

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

Fit is the average pairing score against potato, butter, milk, pepper, 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.

You might also like

Potato CroquettesPotato Croquettes255 recipesPotato RollsPotato Rolls78 recipesPotato ChipsPotato Chips53 recipesSweet Potato CroquettesSweet Potato Croquettes53 recipes