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 Sponge
Ingredients
Directions
Prepare
Soak the gelatine in ½ cup of cold water for 2 hours.
Squeeze the lemons and strain the juice over the sugar.
Beat the yolks of the eggs and mix with the remaining water.
Make the custard
Add the sugar and lemon juice to the egg yolk mixture and cook in a double boiler until it thickens.
Add the soaked gelatine and strain into a tin basin.
Place the basin in a pan of ice water and whisk occasionally until cooled but not hardened.
Whip and set
Add the unbeaten egg whites and beat continuously until the mixture thickens.
Pour into molds that have been wet with cold water and serve with cream and sugar.
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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Egg + sugartop 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
- Eggs
- Yolks thicken the custard and unbeaten whites are whipped in to lighten the texture.
- Gelatine
- Sets the mixture so it holds its shape when chilled in molds.
- Sugar
- Sweetens the dish and balances the sharpness of the lemon juice.
- Lemon juice
- Adds acidity and bright lemon flavour.
The step that matters
Cooling the custard before adding the whites. If the custard is still hot or has begun to set, the whipped egg whites will deflate and lose the light, airy texture. Cooling it only until thick and not hardened keeps the foam stable.
Swap the lemon
How well each one fits the dish's main ingredients (egg, sugar):
- Vanillafits better
- Raisinfits about as well
- Lemonthe original
- Datesfits less well
Fit is the average pairing score against egg, sugar. 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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