Why it works: Parsley and pepper match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 34,122 recipes mention both. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓
Tomato Sauce
Ingredients
Directions
In a pot, combine tomatoes, sliced onion, bay leaf, mace, and parsley.
Cook for 15 minutes.
Blend flour with butter and add to the pot.
Press the mixture through a sieve and return to the pot.
Cook well, then season with salt and pepper.
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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Parsley + peppertop 2% of all pairsAroma overlapstrongMentioned together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Tomato + peppertop 7% of all pairsAroma overlapmoderateMentioned together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + oniontop 8% of all pairsAroma overlapmoderateMentioned together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + parsleytop 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).
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 and acidity that form the base of the sauce.
- Flour
- Thickens the sauce by binding with butter and liquid as it cooks.
- Butter
- Adds richness and carries flavor, and helps the flour blend smoothly into the sauce.
- Onion
- Adds savory sweetness and aromatic depth as it cooks down into the sauce.
The step that matters
Blend flour with butter and add to the pot. Flour added directly to hot liquid can form lumps. Blending it with butter first coats the starch grains so they disperse evenly and thicken the sauce smoothly.
Flavor stand-ins for the mace
How well each one fits the dish's main ingredients (tomato, onion, parsley, flour, butter, pepper):
- Thymebetter flavor fit
- Garlicbetter flavor fit
- Capersbetter flavor fit
- Macethe original
Fit is the average pairing score against tomato, onion, parsley, flour, butter, pepper. 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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