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
Stew the tomatoes with chopped parsley, salt, and pepper to taste.
Strain the mixture and bring it to a boil.
In a separate bowl, mix the flour with the butter until smooth.
Add the flour mixture to the boiling sauce and stir well.
Remove from heat once it boils.
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 + parsleytop 8% of all pairsSmell alikemoderateCooked together5,398 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Parsley + flourtop 12% of all pairsSmell alikemoderateCooked together16,675 recipes
Shared aroma: isobutyraldehyde (malty, green).
Flour and butter barely smell alike, yet cooks put them together in 124,287 recipes: they work on texture and structure more than aroma.
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, moisture and flavour of the sauce.
- Flour
- Thickens the sauce as it heats with the liquid.
- Butter
- Adds richness and helps the flour blend smoothly into the sauce.
The step that matters
Adding the flour mixture to the boiling sauce. Flour thickens only when heated in liquid, but if it is added without being smoothed into the butter first, it can clump. Stirring well as it goes in disperses the starch so the sauce thickens evenly.
Swap the tomato
How well each one fits the dish's main ingredients (parsley, pepper, flour, butter):
- Shallotfits better
- Carrotfits better
- Chivefits better
- Tomatothe original
Fit is the average pairing score against parsley, pepper, flour, butter. 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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