Why it works: Lemon and apple are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 7,551 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Apple Cake
Ingredients
Directions
Make the apple mixture
Beat the egg whites until stiff.
Mix in the sugar, lemon juice, and grated apples.
Heat the mixture in a double boiler until hot.
Assemble
Cool the mixture and spread it between layers of raised 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.
Photo for illustrative purposes only · Contact us to use it
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 + appletop 14% of all pairsSmell alikemoderateCooked together7,551 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Sugar + appletop 18% of all pairsSmell alikelowCooked together16,478 recipes
Shared aroma: beta-damascenone (apple, rose).
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Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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Egg + lemontop 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).
Sugar and apple barely smell alike, yet cooks put them together in 16,478 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
- Egg whites
- Beaten to stiffness, they trap air and give the filling a light, airy body.
- Sugar
- Adds sweetness and helps stabilise the beaten whites while the mixture is heated.
- Tart apples
- Provide the main fruit flavour and moisture, with acidity that balances the sweetness.
- Lemon juice
- Adds acidity that brightens the apple flavour and helps keep it from tasting flat.
The step that matters
Heating the mixture in a double boiler. Gentle, indirect heat warms the egg whites without scrambling them. Overheating over direct flame can curdle the eggs and make the filling grainy.
Swap the apple
How well each one fits the dish's main ingredients (egg, sugar, lemon):
- Orangefits better
- Vanillafits better
- Limefits better
- Applethe original
Fit is the average pairing score against egg, sugar, lemon. 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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