Why it works: Lemon and sugar 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 ↓
Lemon Jelly for Jam Sandwich
Ingredients
Directions
Combine boiling water and sugar in a pot over heat.
Mix cornstarch with lemon juice until smooth, then stir into the boiling mixture.
Cook until thickened.
Remove from heat and let cool before spreading on cake.
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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Lemon + sugartop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
Lemon and sugar 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
- Sugar
- Provides sweetness and body to the filling as it dissolves in the hot water.
- Cornstarch
- Thickens the liquid into a spreadable filling when heated.
- Lemon
- Adds acidity and bright flavour from the juice and rind.
The step that matters
Stirring cornstarch into the boiling mixture. Cornstarch must be fully smooth before it goes in, or it forms lumps. Keep it moving as it heats so it thickens evenly rather than clumping.
“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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