Why it works: Tomato and pepper 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 ↓
Tomato Jelly
Ingredients
Directions
Cover the canned tomatoes with vinegar and let sit overnight.
Put the mixture on the stove and add the brown sugar and red pepper.
Boil for four 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 their aromas overlap, and how often cooks already put them together.
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Tomato + peppertop 7% of all pairsSmell alikemoderateCooked together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Vinegar + peppertop 14% of all pairsSmell alikemoderateCooked together27,814 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Vinegar + sugartop 15% of all pairsSmell alikemoderateCooked together20,806 recipes
Shared aroma: beta-damascenone (apple, rose).
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Tomato + vinegartop 16% of all pairsSmell alikemoderateCooked together5,063 recipes
Shared aroma: beta-damascenone (apple, rose).
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Sugar + peppertop 32% of all pairsSmell alikelowCooked together19,401 recipes
Shared aroma: 2-nonenal (fatty, green).
Sugar and pepper barely smell alike, yet cooks put them together in 19,401 recipes: they 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
- Tomatoes
- Provide the bulk and body of the jelly as they cook down.
- Vinegar
- Adds acidity that balances the sweetness and brightens the flavor.
- Light brown sugar
- Adds sweetness and, as it reduces, helps the mixture thicken into a jelly.
- Red pepper
- Adds heat and a sharp, spicy note to the sweet-sour base.
The step that matters
Boil for four hours. Long simmering evaporates water and concentrates sugar, which is what turns the tomato mixture thick and jelly-like. Stopping early leaves it runny, and boiling too hard or unattended can scorch the sugar on the bottom of the pot.
Swap the tomato
How well each one fits the dish's main ingredients (vinegar, sugar, pepper):
- Capsicumfits better
- Mustardfits better
- Cabbagefits better
- Tomatothe original
Fit is the average pairing score against vinegar, sugar, pepper. 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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