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
Make the lemon base
Strain the lemon juice over the sugar.
Beat the egg yolks and mix with ½ cup of the water used to soak the gelatine.
Add the sugar and lemon juice to this mixture and cook until it begins to thicken.
Thicken and cool
Add the soaked gelatine and strain into a basin.
Place the basin in a pan of water to cool.
Beat with a whisk until cooled but not hardened.
Fold, set and serve
Fold in the egg whites until it begins to thicken.
Pour into a mold and set to harden.
Serve with powdered sugar and cream.
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
- Egg yolks thicken the custard base, and whites lighten the mixture when folded in.
- Sugar
- Sweetens the dish and balances the sharpness of the lemon juice.
- Lemon juice
- Provides sharp acidity and the main lemon flavour.
- Gelatine
- Sets the mixture so it holds its shape in the mold.
The step that matters
Cooking the yolk, lemon and sugar mixture. Egg yolks can scramble if heated too fast or too long. Cook gently and stop as soon as the mixture begins to thicken, because the yolks set the custard and overheating makes it grainy.
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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