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Potato Soup

A simple potato soup made by boiling potatoes, mashing them, and adding a browned butter and flour mixture, seasoned with salt and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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

  1. Peel the potatoes and boil them in 2 quarts of water until soft.

  2. Drain the water, mash the potatoes finely, and return them to the pot.

  3. In a separate pan, melt the butter and fry the flour (and onion, if using) until brown.

  4. Add the browned mixture to the soup and season with salt and pepper.

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

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

  3. Pepper + oniontop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

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

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

    Shared aroma: isobutyraldehyde (malty, green).

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

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

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
Provide the main body, and their starch thickens the soup as they are mashed.
Butter
Adds richness and fat, carrying flavour through the soup.
Flour
Thickens the soup when cooked in fat, and browning adds a nutty, toasted flavour.

The step that matters

Browning the flour. Flour cooked in butter must be stirred and cooked until it turns the stated brown colour. Undercooked flour tastes raw and pasty, while overcooked flour burns and turns bitter.

Swap the onion

The recipe marks onion as optional. How well each one fits the dish's main ingredients (potato, butter, flour, pepper):

  1. Chivefits better
  2. Spinachfits better
  3. Capsicumfits about as well
  4. Onionthe original

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