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Tomato Soup

A simple tomato soup made with canned tomatoes, water, spices, and a butter‑flour roux.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 ingredients
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Tomato Soup

Why it works: Tomato and onion are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 20,633 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Tomato Soup

Ingredients

Directions

Make the soup

  1. Combine tomatoes, cold water, cloves, peppercorns, salt, and sugar in a pot.

  2. Boil for 20 minutes.

Thicken and finish

  1. In a separate bowl, cream together the butter and flour.

  2. Pour the butter and flour mixture into the soup.

  3. Cook for an additional 5 minutes.

  4. Strain the soup and serve hot.

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. Tomato + oniontop 8% of all pairs
    Smell alikemoderate
    Cooked together20,633 recipes

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

  2. Tomato + clovetop 12% of all pairs
    Smell alikemoderate
    Cooked together3,474 recipes

    Shared aroma: ethyl caproate (fruity, apple peel).

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

    Shared aroma: isobutyraldehyde (malty, green).

  4. Clove + oniontop 13% of all pairs
    Smell alikemoderate
    Cooked together16,901 recipes

    Shared aroma: 2-nonanone (fruity, floral).

  5. Sugar + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

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

Tomatoes
Provide the main body, acidity and flavor of the soup.
Butter
Adds richness and fat that carries flavor in the soup.
Flour
Thickens the soup when cooked with butter and liquid.
Sugar
Balances the acidity of the tomatoes with sweetness.

The step that matters

Adding the butter and flour mixture. Flour mixed into fat and added to hot liquid can clump if not blended smoothly first. Cooking it for a few minutes after adding helps the starch swell evenly and thicken the soup.

Swap the onion

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

  1. Capsicumfits better
  2. Sweet potatofits better
  3. Okrafits better
  4. Onionthe original

Fit is the average pairing score against tomato, clove, sugar, 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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