Why it works: Tomato and rice match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and 3,065 recipes mention both. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Tomato Soup for Four
Ingredients
Directions
Prepare the base
Chop the onion and sauté it in butter until brown.
Strain the tomatoes through a sieve and add to the onion.
Simmer and season
Add enough stock or hot water to achieve desired consistency.
Stir in the rice and simmer for 20 minutes.
Season to taste.
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.
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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Tomato + ricetop 6% of all pairsAroma overlapstrongMentioned together3,065 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Onion + tomatotop 8% of all pairsAroma overlapmoderateMentioned together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Parsley + tomatotop 8% of all pairsAroma overlapmoderateMentioned together5,398 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Onion + parsleytop 9% of all pairsAroma overlapmoderateMentioned together25,843 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Onion + ricetop 9% of all pairsAroma overlapmoderateMentioned together10,433 recipes
Shared aroma: 2,4-decadienal (seaweed).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Onion
- Browning in butter builds savory, sweet depth in the soup's base.
- Butter
- Fat that carries flavor and helps the onion brown.
- Tomatoes
- Provide the main flavor, mild acidity, and body of the soup.
- Rice
- Absorbs liquid and softens as it simmers, thickening the soup.
The step that matters
Simmering the rice with enough liquid. Rice absorbs liquid and releases starch as it cooks. If there is too little stock or water, the rice stays firm and can scorch on the bottom of the pan, while enough liquid lets it cook through and thicken the soup evenly.
Flavor stand-ins for the parsley
How well each one fits the dish's main ingredients (onion, butter, tomato, rice):
- Garlicbetter flavor fit
- Thymebetter flavor fit
- Celeryabout as good a flavor fit
- Parsleythe original
Fit is the average pairing score against onion, butter, tomato, rice. 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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