Why it works: Milk and butter 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 ↓
Tomato Soup
Ingredients
Directions
Prepare the tomatoes
Rub the cooked tomatoes through a sieve.
Heat the tomatoes in a granite pan and the milk in another pan.
Make the soup
In a bowl, rub the butter and flour together to form a smooth paste, then add to the heated milk.
Stir in the salt and white pepper.
When the mixture is almost boiling, slowly stir in the tomatoes, mixing constantly.
Allow the mixture to come to a boil.
Serve with crackers.
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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Milk + buttertop 7% of all pairsAroma overlapmoderateMentioned together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Tomato + peppertop 7% of all pairsAroma overlapmoderateMentioned together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + flourtop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Milk + flourtop 14% of all pairsAroma overlaplowMentioned together78,219 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Tomato + milktop 15% of all pairsAroma overlapmoderateMentioned together2,226 recipes
Shared aroma: 1-octen-3-one (mushroom, metallic).
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
- Butter and flour
- Form a smooth paste that thickens the milk into a creamy base.
- Milk
- Provides the creamy body of the soup.
- Cooked tomatoes
- Supply the main tomato flavour and acidity of the soup.
The step that matters
Adding the tomatoes to the hot milk. Tomatoes are acidic and can curdle hot milk. Stirring them in slowly and constantly, while the mixture is only almost boiling, helps the milk stay smooth instead of separating.
Flavor stand-ins for the white pepper
How well each one fits the dish's main ingredients (tomato, milk, butter, pepper, flour):
- Cinnamonbetter flavor fit
- Cardamombetter flavor fit
- Thymebetter flavor fit
- White pepperthe original
Fit is the average pairing score against tomato, milk, butter, pepper, flour. 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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