Why it works: Lemon and pepper match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 27,047 recipes mention both. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Tomato Sauce
Ingredients
Directions
Chop the tomatoes, onions, apples, and raisins finely.
Add the brown sugar, water, red pepper, and vinegar.
Boil the mixture for 2 hours.
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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Lemon + peppertop 3% of all pairsAroma overlapstrongMentioned together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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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 + lemontop 11% of all pairsAroma overlapmoderateMentioned together4,592 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Onion + peppertop 11% of all pairsAroma overlapmoderateMentioned together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Tomatoes
- Form the bulk of the sauce and supply moisture and body as they break down.
- Onions
- Add savory depth and soft texture as they cook down into the sauce.
- Apples
- Contribute natural pectin that helps the sauce thicken as it cooks.
- Raisins
- Add concentrated sweetness and chewy bits that blend into the sauce.
- Brown sugar
- Adds sweetness and molasses flavor that balances the sharpness of the vinegar.
- Vinegar
- Brings acidity that sharpens the flavor and balances the sweetness.
The step that matters
Boil for the full 2 hours. The sauce thickens only as water evaporates during long simmering. Stopping early leaves it thin and watery, while the sugars and fruit concentrate and darken as the liquid reduces.
Flavor stand-ins for the raisin
How well each one fits the dish's main ingredients (tomato, onion, apple, lemon, sugar, pepper, vinegar):
- Mangobetter flavor fit
- Cherrybetter flavor fit
- Plumbetter flavor fit
- Raisinthe original
Fit is the average pairing score against tomato, onion, apple, lemon, sugar, 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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