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 Sauce
Ingredients
Directions
Make the sauce
In a saucepan, combine strained tomatoes, bay leaf, scraped onion, parsley, salt, and pepper. Boil for five minutes.
Remove the parsley and bay leaf.
Thicken and finish
In a small bowl, blend together butter and flour.
Add the butter-flour mixture to the sauce to thicken.
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 + 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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Tomato + parsleytop 8% of all pairsSmell alikemoderateCooked together5,398 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Onion + parsleytop 9% of all pairsSmell alikemoderateCooked together25,843 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
- Strained tomatoes
- Form the base of the sauce and provide its main liquid and tomato flavor.
- Butter and flour
- Blended together, the flour thickens the sauce, and the butter adds richness and smoothness.
The step that matters
Adding the butter-flour mixture. Flour must be blended with butter first so it disperses without lumps. Added directly to hot liquid, it can clump, and the sauce may thicken unevenly.
Swap the tomato
How well each one fits the dish's main ingredients (onion, parsley, pepper, butter, flour):
- Chivefits better
- Shallotfits better
- Okrafits better
- Tomatothe original
Fit is the average pairing score against onion, parsley, pepper, butter, flour. 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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