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 ↓
Cream Tomato Soup
Ingredients
Directions
Make the tomato base
Strain the can of tomatoes through a sieve.
Add baking soda, bring to a boil, and skim off any foam.
Season with butter, salt, and pepper.
Add the milk and serve
Scald the milk and add it along with the cracker crumbs to the tomato mixture.
Serve hot.
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.
-
Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Tomato + peppertop 7% of all pairsSmell alikemoderateCooked together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Tomato + milktop 15% of all pairsSmell alikemoderateCooked together2,226 recipes
Shared aroma: 1-octen-3-one (mushroom, metallic).
-
Butter + peppertop 21% of all pairsSmell alikemoderateCooked together85,593 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
-
Tomato + buttertop 22% of all pairsSmell alikemoderateCooked together6,918 recipes
Shared aroma: 3-hexenal (apple, fruity).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Tomatoes
- Provide the main flavor, acidity, and liquid base of the soup.
- Baking soda
- Neutralizes some of the tomatoes' acidity, which helps keep the milk from curdling.
- Milk
- Adds creaminess, body, and a mild sweetness that softens the tomato's sharpness.
- Butter
- Adds fat for richer flavor and a smoother, silkier mouthfeel.
- Cracker crumbs
- Absorb liquid and swell, thickening the soup and giving it more body.
The step that matters
Adding the milk to the tomatoes. Tomatoes are acidic, and acid can make milk curdle when the two are combined. Baking soda raises the pH to reduce this risk. Scalding the milk first also helps it blend smoothly into the hot tomato mixture.
Swap the tomato
How well each one fits the dish's main ingredients (butter, pepper, milk):
- Potatofits better
- Capsicumfits better
- Tomatothe original
- Asparagusfits about as well
Fit is the average pairing score against butter, pepper, milk. 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.
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.

Tomato Soup526 recipes
Cream of Tomato Soup107 recipes
Tomato Bisque61 recipes
Tomato Fritters23 recipes