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Soup

Tomato Bisque

A hot tomato soup thickened with soda cracker dust and butter.

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

Why it works: Milk and butter 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 Bisque

Ingredients

Directions

  1. Strain the tomatoes and bring them to a boil.

  2. Add a small amount of soda, about the size of the end of a knife blade.

  3. When it foams, add the milk, cracker dust, butter, salt, and pepper.

  4. Serve very 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. Milk + buttertop 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 + eggtop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

  5. Milk + eggtop 18% of all pairs
    Smell alikemoderate
    Cooked together88,785 recipes

    Shared aroma: 2-nonenal (fatty, green).

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 acidic tomato flavour of the bisque.
Milk
Adds creaminess and softens the acidity of the tomatoes.
Soda cracker
Rolled fine, it thickens the soup slightly as its starch absorbs liquid.
Butter
Adds richness and a smooth, velvety mouthfeel.

The step that matters

Add the soda a little at a time. Soda reacts with the acid in tomatoes and foams strongly, and too much makes the bisque taste soapy or salty and can cause it to boil over. Adding a small amount and waiting for the foam keeps the balance right.

Swap the tomato

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

  1. Capsicumfits better
  2. Potatofits better
  3. Asparagusfits better
  4. Tomatothe original

Fit is the average pairing score against milk, butter, egg, 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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