Why it works: Tomato and pepper are a kitchen classic. They rank in the top 7% of all ingredient pairs, and 17,923 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Tomato Sauce
Ingredients
Directions
Prepare
Scald the tomatoes and peel them.
Chop the onions finely.
Cook
Combine all ingredients in a pot.
Boil for 3 hours, stirring occasionally.
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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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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Onion + peppertop 11% of all pairsAroma overlapmoderateMentioned together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + vinegartop 14% of all pairsAroma overlapmoderateMentioned together18,226 recipes
Shared aroma: acetic acid (sour, vinegar).
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Vinegar + peppertop 14% of all pairsAroma overlapmoderateMentioned together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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 tangy flavour of the sauce.
- Onions
- Add savoury depth and aroma that builds as they soften during long cooking.
- Brown sugar
- Adds sweetness and helps balance the acidity of the vinegar and tomatoes.
- Vinegar
- Adds acidity that brightens the sauce and helps preserve its flavour.
The step that matters
Boil for 3 hours, stirring occasionally. A long, gentle boil evaporates water and concentrates the sauce into a thick, rich texture. Occasional stirring prevents sugars and solids from scorching on the bottom of the pot.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (tomato, sugar, vinegar, pepper):
- Capsicumbetter flavor fit
- Cucumberbetter flavor fit
- Mustardbetter flavor fit
- Onionthe original
Fit is the average pairing score against tomato, sugar, vinegar, 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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