Why it works: Pepper and parsley 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
Prepare the tomato juice
Add the seasonings to the tomato juice.
Simmer until reduced to about 1 cup.
Make the sauce
Melt the butter in a saucepan.
Stir in the flour until smooth.
Add the strained tomato juice.
Cook for a few minutes until smooth and thick.
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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Pepper + parsleytop 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
- Tomato juice
- Forms the liquid base of the sauce and carries its tomato flavour.
- Flour
- Thickens the sauce as it cooks with the butter and liquid.
- Butter
- Adds richness and fat, and helps form the smooth roux with the flour.
The step that matters
Stirring the flour into the melted butter. Flour must be stirred constantly into the melted butter so it cooks evenly without lumps. Mixing it into the hot fat first coats each starch granule, which lets it thicken the liquid smoothly when added.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (tomato, flour, butter, pepper, parsley):
- Okrabetter flavor fit
- Carrotbetter flavor fit
- Capsicumbetter flavor fit
- Onionthe original
Fit is the average pairing score against tomato, flour, butter, pepper, parsley. 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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