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Potato Soup

A simple soup made from boiled potatoes, onions, butter, flour, and water, seasoned with salt.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Potato Soup

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 ↓

Potato Soup

Ingredients

Directions

Prepare the potatoes

  1. Boil the potatoes until tender, then mash them until smooth.

Make the soup

  1. In a stewpan, melt the butter and slice the onion into it.

  2. Cook the onion until tender but not browned.

  3. Sprinkle the baked flour over the onion to absorb the butter.

  4. Gradually stir in the boiling water and add the mashed potatoes.

  5. Season with salt 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.

Photo for illustrative purposes only · Contact us to use it

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 + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  3. Potato + buttertop 13% of all pairs
    Smell alikemoderate
    Cooked together6,456 recipes

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

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

    Shared aroma: decanal (soap, orange peel).

  5. Potato + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together5,355 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Butter and flour barely smell alike, yet cooks put them together in 124,287 recipes: they work on texture and structure more than aroma.

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

What each ingredient does

Potatoes
Break down into a smooth mash that thickens the soup and gives it body.
Baked flour
Absorbs the butter and onion juices, then thickens the liquid as it hydrates.
Butter
Adds richness and carries the onion's flavour into the soup.
White onion
Provides sweet, savoury aromatic flavour as it softens in the butter.

The step that matters

Cook the onion until tender but not browned. Browning the onion adds bitter, toasted notes that change the soup's clean flavour. Gentle softening draws out sweetness while keeping the colour pale.

Swap the onion

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

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

Fit is the average pairing score against potato, butter, 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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