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 tomato base
Simmer tomatoes, bay leaf, parsley, and onion for 15 minutes.
Strain the mixture through a fine sieve.
Thicken and season
Melt butter in a saucepan over low heat without browning.
Add flour to the melted butter and mix until smooth.
Stir the smooth mixture into the strained tomato sauce.
Season with salt and pepper 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 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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Parsley + oniontop 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
- Tomatoes
- Provide the main body, acidity, and flavor of the sauce.
- Butter
- Adds richness and fat, and carries flavor through the sauce.
- Flour
- Thickens the sauce by absorbing liquid when cooked in butter.
The step that matters
Melting butter without browning. Over low heat the butter should melt gently without browning, so the flour cooks into a smooth roux with a clean, neutral flavor. Browned butter would change the taste and color of the sauce.
Swap the tomato
How well each one fits the dish's main ingredients (parsley, onion, butter, flour, pepper):
- Chivefits better
- Shallotfits better
- Okrafits better
- Tomatothe original
Fit is the average pairing score against parsley, onion, butter, 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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