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Tomato Soup

A tomato soup made with fresh or canned tomatoes, water, onion, butter, flour, and scalded milk.

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

Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Tomato Soup

Ingredients

Directions

Make the soup

  1. Combine tomatoes and water in a pot.

  2. Add sliced onion.

  3. Melt butter and stir in flour, then cook briefly.

  4. Add the butter-flour mixture to the pot.

  5. Boil the soup slowly for 1 hour.

  6. Strain the soup before serving.

Finish and serve

  1. Stir in scalded milk just before serving.

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. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

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

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

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

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

    Shared aroma: isobutyraldehyde (malty, green).

  4. Flour + milktop 14% of all pairs
    Smell alikelow
    Cooked together78,219 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.
Butter
Adds richness and carries flavour through the soup.
Flour
Thickens the soup slightly when cooked with the butter.
Milk
Adds creaminess and softens the tomato's sharpness.

The step that matters

Adding the butter-flour mixture. Flour cooked briefly in butter forms a roux, which thickens the liquid smoothly. Adding it directly to hot soup without cooking it first can leave lumps.

Swap the tomato

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

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

Fit is the average pairing score against onion, butter, flour, milk. 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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