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 ↓
Ripe Tomato Preserves
Ingredients
Directions
Prepare the tomatoes
Scald the tomatoes.
Slip off the skins.
Combine the tomatoes and sugar in a bowl.
Let stand overnight.
Make the syrup
Drain off the syrup.
Boil it, skimming well.
Add the tomatoes to the syrup.
Boil gently for 20 minutes.
Remove the fruit with a perforated skimmer.
Spread on dishes to cool.
Add the juice of the lemons after the syrup has thickened.
Jar the preserves
Put the preserves in jars.
Fill with hot syrup.
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.
-
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 fruit that becomes the bulk of the preserves and softens during gentle boiling.
- Sugar
- Draws moisture out of the tomatoes and forms a thick syrup that preserves and sweetens the fruit.
- Lemon juice
- Adds acidity that brightens the flavor and helps balance the sweetness of the syrup.
The step that matters
Add the lemon juice after the syrup has thickened. Acid added too early can interfere with sugar thickening and can invert sugar, so timing matters. Adding it once the syrup has thickened keeps the set and flavor balanced.
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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