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 Bisque
Ingredients
Directions
Make the tomato base
Cook the tomatoes with the onion until soft.
Strain the tomato-onion mixture.
Return the strained mixture to the stove.
Dissolve the flour in a little water.
Add the dissolved flour to the tomatoes to thicken.
Season the tomato mixture with salt, pepper, and 2 teaspoons of butter.
Make the milk base
Heat the milk in a separate pot until it boils.
Dissolve the remaining flour in water.
Thicken the milk with the dissolved flour.
Add 2 teaspoons of butter to the milk.
Assemble and serve
Place the croutons in a soup tureen.
Slowly pour the thickened milk into the croutons while stirring.
Gradually add the tomato mixture, stirring continuously.
Taste and adjust seasoning before serving.
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.
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Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Tomato + peppertop 7% of all pairsSmell alikemoderateCooked together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + oniontop 8% of all pairsSmell alikemoderateCooked together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour barely smell alike, yet cooks put them together in 124,287 recipes: they 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 flavor of the bisque.
- Milk
- Adds creaminess and a smooth, mellow texture to the soup.
- Flour
- Thickens the liquids so the bisque has body rather than running thin.
- Butter
- Adds richness and a rounded flavor to the soup.
- Onion
- Adds savory aromatic sweetness that builds the base flavor.
The step that matters
Thickening the milk with dissolved flour. Flour mixed directly into hot liquid clumps; dissolving it in cold water first lets starch disperse evenly, and the milk must be simmering-hot so the starch swells and thickens smoothly.
Swap the onion
How well each one fits the dish's main ingredients (tomato, butter, milk, flour, pepper):
- Capsicumfits better
- Potatofits better
- Okrafits better
- Onionthe original
Fit is the average pairing score against tomato, butter, milk, flour, 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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