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 ↓
Cream of Tomato Soup
Ingredients
Directions
Prepare the tomatoes
Cook the tomatoes slowly with the sugar, salt, parsley, and white pepper for 10 minutes.
Rub the mixture through a strainer.
Make the milk base
Scald the milk.
Thicken the milk with the flour and butter rubbed to a paste.
Combine and serve
Reheat the strained tomatoes and add the baking soda.
Combine the tomatoes with the thickened milk and serve at once.
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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Parsley + tomatotop 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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Parsley + flourtop 12% of all pairsAroma overlapmoderateMentioned together16,675 recipes
Shared aroma: isobutyraldehyde (malty, green).
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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
- Milk
- Forms the creamy body of the soup, liquid base thickened into a smooth cream.
- Tomatoes
- Supply the main flavor, acidity, and color of the soup.
- Flour
- Thickens the milk so the soup holds a smooth, creamy texture.
- Butter
- Adds fat and richness, and helps the flour blend smoothly into the milk.
- Baking soda
- Neutralizes some of the tomato acidity, reducing sharpness and curdling risk.
The step that matters
Combine the tomatoes with the thickened milk. Tomato acid can cause hot milk to curdle. Keeping the tomatoes hot and adding them to the milk gently, then serving at once, helps the soup stay smooth.
Flavor stand-ins for the white pepper
How well each one fits the dish's main ingredients (milk, parsley, tomato, butter, flour, sugar):
- Cinnamonbetter flavor fit
- Cardamombetter flavor fit
- Nutmegbetter flavor fit
- White pepperthe original
Fit is the average pairing score against milk, parsley, tomato, butter, flour, sugar. 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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