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Tomato Soup

A simple tomato soup made with butter, cornstarch, tomato, water, salt, pepper, and optional onion.

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

Why it works: Tomato and pepper are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 17,923 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Tomato Soup

Ingredients

Directions

  1. Cook the butter in a saucepan until it bubbles.

  2. If desired, fry sliced onion with the butter before adding cornstarch.

  3. Add the cornstarch and mix into a smooth paste.

  4. Gradually stir in the strained tomato and boiling water until smooth.

  5. Cook for at least 10 minutes to eliminate the raw taste of the cornstarch.

  6. Adjust thickness by adding more cornstarch or boiling water as needed.

  7. Season with salt and pepper 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. Tomato + peppertop 7% of all pairs
    Smell alikemoderate
    Cooked together17,923 recipes

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

  2. Tomato + oniontop 8% of all pairs
    Smell alikemoderate
    Cooked together20,633 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 + oniontop 15% of all pairs
    Smell alikemoderate
    Cooked together42,912 recipes

    Shared aroma: decanal (soap, orange peel).

  5. Butter + peppertop 21% of all pairs
    Smell alikemoderate
    Cooked together85,593 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

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

What each ingredient does

Butter
Adds richness and carries flavour when cooked until it bubbles.
Cornstarch
Thickens the soup into a smooth, body-rich texture as it heats.
Strained tomato
Provides the main body, acidity and tomato flavour of the soup.

The step that matters

Cook for at least 10 minutes after adding the cornstarch liquid. Cornstarch needs to reach a simmer and cook through to thicken fully and lose its raw, starchy taste. Stopping early leaves the soup thin or tasting floury.

Swap the onion

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

  1. Capsicumfits better
  2. Potatofits better
  3. Carrotfits about as well
  4. Onionthe original

Fit is the average pairing score against butter, tomato, 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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