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
Chop the tomatoes, green peppers, and onions together.
Make the sauce
Heat the vinegar in a pot until boiling.
Add the chopped vegetables and salt to the boiling vinegar and heat well.
Bottle the sauce while it is still hot.
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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Pepper + oniontop 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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Pepper + vinegartop 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 bulk and body of the sauce, with moisture and mild acidity.
- Vinegar
- Adds sharp acidity that gives the sauce its tang and helps preserve it.
- Onions
- Add savory aroma and sweetness that build flavor as the sauce heats.
- Green peppers
- Contribute a grassy, slightly bitter flavor and some texture to the sauce.
The step that matters
Add the chopped vegetables to the boiling vinegar and heat well. Adding vegetables to boiling vinegar starts the cooking immediately and brings the acid to work on them. Heating them thoroughly softens the vegetables and ensures the sauce is evenly cooked, which matters for both texture and keeping quality.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (tomato, pepper, vinegar):
- Capsicumbetter flavor fit
- Cucumberbetter flavor fit
- Mustardbetter flavor fit
- Onionthe original
Fit is the average pairing score against tomato, pepper, vinegar. 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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