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
Ingredients
Directions
Prepare
Soak the gelatine in ½ cup of water for 30 minutes.
Rub some sugar on the lemon peel to extract the oil.
Make the jelly
Pour 6 cups of boiling water over the soaked gelatine.
Add lemon juice, sugar, and the beaten egg white and shell.
Bring to a boil, then remove from heat and let sit for a few moments.
Strain and set
Skim carefully and strain through a jelly bag into molds.
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).
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Lemon + eggtop 19% of all pairsSmell alikelowCooked together44,316 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
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Sugar + eggtop 21% of all pairsSmell alikemoderateCooked together122,807 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
- Gelatine
- Provides the structure that lets the liquid set into a firm jelly.
- Lemon juice
- Adds sharp acidity and the main lemon flavour.
- Sugar
- Adds sweetness that balances the sharpness of the lemon juice.
- Egg white
- Its proteins coagulate when heated and trap cloudy particles, helping clarify the jelly.
The step that matters
Bring to a boil, then remove from heat. Egg white proteins coagulate as the mixture heats, trapping cloudy particles into a raft. Boiling it too long or stirring it hard breaks up the raft, so the jelly stays cloudy and harder to clear when skimmed and strained.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, egg):
- Vanillafits better
- Raisinfits about as well
- Lemonthe original
- Datesfits less well
Fit is the average pairing score against sugar, egg. 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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