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Clear Tomato Soup

A clear soup made from tomatoes, onions, water, butter, flour, salt, and pepper.

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

Clear Tomato Soup

Ingredients

Directions

  1. Boil the tomatoes and onions in boiling water for one hour.

  2. In a separate bowl, rub together the butter and flour.

  3. Stir the butter and flour mixture into the soup just before removing it from the heat.

  4. Add salt and pepper to taste.

  5. Strain the soup and serve.

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

    Shared aroma: decanal (soap, orange peel).

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 flavour of the soup as they cook down in water.
Onions
Add savoury sweetness and aroma to the broth as they simmer with the tomatoes.
Butter and flour
Rubbed together and stirred in to thicken the soup slightly, giving it body.

The step that matters

Stirring in the butter and flour mixture. Flour needs heat to thicken, but if it is added to liquid unevenly it forms lumps. Rubbing it with butter first helps it disperse, and stirring it in just before removing the soup from the heat keeps the thickening controlled.

Swap the tomato

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

  1. Chivefits better
  2. Okrafits better
  3. Leekfits better
  4. Tomatothe original

Fit is the average pairing score against onion, 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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