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Tomato Soup

A simple tomato soup made with canned tomatoes, water, baking soda, butter, salt, pepper, and milk.

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

  1. Boil the tomatoes and water hard until the tomatoes are cooked.

  2. Add the baking soda and strain the mixture.

  3. Return the strained mixture to the stove and season with butter, salt, and pepper.

  4. Slowly add the milk and bring to a boil.

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 + peppertop 7% of all pairs
    Smell alikemoderate
    Cooked together17,923 recipes

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

  3. Tomato + milktop 15% of all pairs
    Smell alikemoderate
    Cooked together2,226 recipes

    Shared aroma: 1-octen-3-one (mushroom, metallic).

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

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

  5. Tomato + buttertop 22% of all pairs
    Smell alikemoderate
    Cooked together6,918 recipes

    Shared aroma: 3-hexenal (apple, fruity).

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 and tangy, acidic flavor of the soup.
Baking soda
Neutralizes some of the tomatoes' acid, mellowing the flavor and reducing tartness.
Butter
Adds fat for richer flavor and a smoother, rounder mouthfeel.
Milk
Adds creaminess, body, and mild sweetness, turning the soup smooth and rich.

The step that matters

Slowly adding the milk. Milk proteins can curdle or separate when they meet hot acid. Adding the milk slowly, and bringing the soup to a boil with care, helps keep it smooth. The baking soda lowers the acidity beforehand, which also reduces the risk of curdling.

Swap the tomato

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

  1. Potatofits better
  2. Capsicumfits better
  3. Tomatothe original
  4. Asparagusfits about as well

Fit is the average pairing score against butter, pepper, 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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