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 Jelly
Ingredients
Directions
Cover the canned tomatoes with vinegar and let them sit overnight.
Put the mixture on the stove and add the brown sugar and red pepper.
Boil for four 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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Vinegar + peppertop 14% of all pairsAroma overlapmoderateMentioned together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Vinegar + sugartop 15% of all pairsAroma overlapmoderateMentioned together20,806 recipes
Shared aroma: beta-damascenone (apple, rose).
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Tomato + vinegartop 16% of all pairsAroma overlapmoderateMentioned together5,063 recipes
Shared aroma: beta-damascenone (apple, rose).
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Sugar + peppertop 32% of all pairsAroma overlaplowMentioned together19,401 recipes
Shared aroma: 2-nonenal (fatty, green).
Sugar and pepper share little aroma chemistry, yet 19,401 recipes mention both: they likely work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Canned tomatoes
- Provide the bulk of the jelly and its fruity, acidic base.
- Vinegar
- Adds acidity that balances the sweetness and helps break down the tomatoes.
- Light brown sugar
- Adds sweetness and, as it cooks down, body and a deep caramel flavor.
- Red pepper
- Adds gentle heat that cuts through the sweetness.
The step that matters
Boil for four hours, stirring occasionally. Long, gentle boiling evaporates water and concentrates the sugar so the mixture thickens into a jelly. Stirring prevents scorching on the bottom of the pot, where sugar burns easily.
“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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