Why it works: Parsley and pepper match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 34,122 recipes. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓
Tomato Soup with Rice
Ingredients
Directions
Make the soup base
In a sauté pan, fry the sliced onion in butter until soft.
Add the chopped tomatoes and parsley.
Pass the mixture through a sieve.
Thicken and finish
Melt butter the size of a pigeon's egg until bubbling.
Sprinkle in the flour and cook for 1 minute.
Stir in the tomato mixture.
Season with pepper and salt.
If using, add the stock.
Return the soup to the heat until hot.
Stir in the fresh-boiled rice.
Add the baking soda.
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 their aromas overlap, and how often cooks already put them together.
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Parsley + peppertop 2% of all pairsSmell alikestrongCooked together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Tomato + ricetop 6% of all pairsSmell alikestrongCooked together3,065 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
-
Tomato + peppertop 7% of all pairsSmell alikemoderateCooked together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + tomatotop 8% of all pairsSmell alikemoderateCooked together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + parsleytop 8% of all pairsSmell alikemoderateCooked together5,398 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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 flavour of the soup.
- Butter
- Adds richness and carries flavour when frying the onion and enriching the roux.
- Flour
- Thickens the soup slightly when cooked in melted butter before the tomatoes are added.
- Fresh-boiled rice
- Adds body and bulk, softening the soup and giving it a heartier texture.
- Baking soda
- Neutralises some of the tomatoes' acidity, mellowing the sharp taste.
The step that matters
Adding the baking soda. Baking soda reacts with acid and releases gas quickly, so adding too much can give the soup a soapy taste and an unpleasant flavour. Add only the small amount called for and stir it in fully.
Swap the onion
How well each one fits the dish's main ingredients (butter, tomato, parsley, flour, rice, pepper):
- Okrafits better
- Carrotfits better
- Capsicumfits better
- Onionthe original
Fit is the average pairing score against butter, tomato, parsley, flour, rice, 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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