Why it works: Pepper and lemon 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 Jelly
Ingredients
Directions
Make the jelly
Combine tomatoes, chopped onion, chopped celery, salt, and pepper in a pot.
Bring the mixture to a boil, then strain it.
Dissolve the gelatine in cold water and add it to the strained mixture.
Stir in the lemon juice and pour into a mold.
Set
Refrigerate until set.
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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Pepper + lemontop 3% of all pairsAroma overlapstrongMentioned together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Celery + lemontop 3% of all pairsAroma overlapstrongMentioned together3,467 recipes
Shared aroma: beta-phellandrene (minty, terpene).
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Tomato + celerytop 4% of all pairsAroma overlapmoderateMentioned together3,377 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Celery + peppertop 5% of all pairsAroma overlapstrongMentioned together16,012 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Onion + celerytop 7% of all pairsAroma overlapmoderateMentioned together18,518 recipes
Shared aroma: guaiacol (smoky, sweet).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Gelatine
- Sets the strained tomato liquid into a firm, sliceable jelly as it chills.
- Tomatoes
- Provide the main body, colour and tomato flavour of the jelly.
- Lemon juice
- Adds acidity that brightens the tomato flavour and balances the salt.
The step that matters
Dissolve the gelatine in cold water before adding it. Gelatine must be fully dissolved so it sets evenly. Clumps or undissolved granules leave soft spots and grainy texture in the finished jelly.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (tomato, celery, pepper, lemon):
- Capsicumbetter flavor fit
- Carrotbetter flavor fit
- Okrabetter flavor fit
- Onionthe original
Fit is the average pairing score against tomato, celery, pepper, lemon. 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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