Why it works: Tomato and lemon are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 4,592 recipes. Both carry 3-hexenal, which smells apple, fruity. The science ↓
Preserved Ripe Tomatoes
Ingredients
Directions
Macerate
Combine the tomatoes, sugar, and lemon juice in a bowl and let them sit overnight.
Make the syrup and cook
Drain off the syrup and boil it, skimming off any foam.
Add the tomatoes to the boiling syrup and cook gently for 20 minutes.
Remove the tomatoes with a perforated skimmer and spread them on dishes.
Boil the syrup down until it thickens, then add the lemon juice just before removing from heat.
Jar and seal
Place the fruit into jars and fill with hot syrup.
Seal the jars once cooled.
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 + lemontop 11% of all pairsSmell alikemoderateCooked together4,592 recipes
Shared aroma: 3-hexenal (apple, fruity).
-
Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
-
Tomato + sugartop 33% of all pairsSmell alikelowCooked together4,667 recipes
Shared aroma: beta-damascenone (apple, rose).
Sugar and lemon barely smell alike, yet cooks put them together in 53,532 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 of the fruit that softens and holds its shape in the syrup.
- Sugar
- Draws out moisture and forms a thick syrup that preserves the fruit and adds sweetness.
- Lemon juice
- Adds acidity that brightens the sweetness and helps keep the fruit's color and flavor.
The step that matters
Boil the syrup down until it thickens. Sugar concentration determines how well the fruit keeps. If the syrup is not boiled down enough, it stays thin and the preserve is less stable. Adding lemon juice just before removing from heat keeps its brightness, since prolonged boiling dulls its fresh flavor.
Swap the tomato
How well each one fits the dish's main ingredients (sugar, lemon):
- Arrowrootfits better
- Sweet potatofits better
- Kalefits better
- Tomatothe original
Fit is the average pairing score against sugar, lemon. 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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