Why it works: Pepper and tomato are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 17,923 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Chili Sauce
Ingredients
Directions
Prepare
Chop the onions, green peppers, and tomatoes finely.
In a large pot, combine the chopped vegetables with sugar, salt, and vinegar.
Mix everything together and bring to a boil.
Cook and store
Boil for 2 ¼ hours.
Pour the sauce into glass jars for storage.
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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Pepper + tomatotop 7% of all pairsSmell alikemoderateCooked together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + tomatotop 8% of all pairsSmell alikemoderateCooked together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + vinegartop 14% of all pairsSmell alikemoderateCooked together18,226 recipes
Shared aroma: acetic acid (sour, vinegar).
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Pepper + vinegartop 14% of all pairsSmell alikemoderateCooked 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
- Ripe tomatoes
- Provide the main body and liquid that cooks down into the sauce.
- Vinegar
- Adds acidity that gives the sauce its sharp, tangy flavour and helps preserve it.
- Sugar
- Adds sweetness that balances the acidity of the vinegar and tomatoes.
- Onions
- Add savoury depth and body as they soften during the long boil.
The step that matters
Boil for 2 ¼ hours. A long, steady boil lets water evaporate so the sauce thickens and the flavours concentrate. Too low a heat can leave it thin, while too hard a boil can scorch the bottom of the pot.
Swap the onion
How well each one fits the dish's main ingredients (sugar, pepper, tomato, vinegar):
- Capsicumfits better
- Cucumberfits better
- Mustardfits better
- Onionthe original
Fit is the average pairing score against sugar, pepper, tomato, vinegar. 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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