Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and 81,283 recipes mention both. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Cream of Tomato Soup
Ingredients
Directions
Make the tomato base
Cook the tomatoes slowly with the sugar, salt, and white pepper for 10 minutes.
Strain the mixture through a fine sieve.
Thicken the milk
In a separate pot, scald the milk.
In a small bowl, mix the butter and flour to form a paste, then add it to the scalded milk to thicken.
Combine and serve
Reheat the strained tomatoes and stir in the baking soda.
Combine the tomato mixture with the thickened milk and serve immediately.
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 aroma chemistry they share, and how many recipes mention both.
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Butter + milktop 7% of all pairsAroma overlapmoderateMentioned together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Tomato + parsleytop 8% of all pairsAroma overlapmoderateMentioned together5,398 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Butter + flourtop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + parsleytop 12% of all pairsAroma overlapmoderateMentioned together16,675 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Parsley + white peppertop 14% of all pairsAroma overlaplowMentioned together1,451 recipes
Shared aroma: myrcene (balsamic, herbaceous).
Butter and flour share little aroma chemistry, yet 124,287 recipes mention both: they likely 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 fat and richness, and helps form the thickening paste with flour.
- Flour
- Thickens the milk so the soup becomes creamy and smooth.
- Milk
- Forms the creamy base that the tomatoes are combined with.
- Baking soda
- Neutralises some of the tomato acidity, reducing curdling risk in the milk.
The step that matters
Combine the tomato mixture with the thickened milk. Tomato acid can curdle hot milk. Baking soda is added to the tomatoes beforehand to reduce acidity, and serving immediately keeps the soup smooth rather than separated.
Flavor stand-ins for the white pepper
How well each one fits the dish's main ingredients (tomato, butter, flour, sugar, milk, parsley):
- Cinnamonbetter flavor fit
- Cardamombetter flavor fit
- Nutmegbetter flavor fit
- White pepperthe original
Fit is the average pairing score against tomato, butter, flour, sugar, milk, parsley. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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