Why it works: Sugar and lemon are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 53,532 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓
Preserved Watermelon or Citron
Ingredients
Directions
Cook the watermelon
Peel the watermelon and boil until soft, testing with a fork.
In a pot, combine the watermelon and sugar, and simmer slowly for 2 hours in the syrup.
Make the syrup
Lift the watermelon out and boil the syrup until thick.
Pour the thick syrup over the watermelon and add the juice of 1 lemon for each quart of 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.
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Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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
- Watermelon
- Its flesh softens as it cooks and becomes tender enough to take up the syrup.
- Sugar
- Sweetens the fruit and, as a thick syrup, helps preserve it by drawing out water.
- Lemon juice
- Adds acidity that brightens the sweetness and balances the flavor of the syrup.
The step that matters
Boil the syrup until thick. The syrup must reach a high enough sugar concentration to preserve the watermelon. Stopping early leaves a thin syrup that spoils more 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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