Why it works: Apple and lemon 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 ↓
Lemon Pie
Ingredients
Directions
The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point. The book gives no cooking times either; the times in the steps were added in transcription, so check for doneness rather than trusting the clock.
Prepare
Preheat the oven to 350°F (175°C).
Make the filling
In a bowl, combine the chopped apple, egg, lemon juice, sugar, water, and baking powder, then mix well until all ingredients are combined.
Bake
Pour the mixture into a pie crust and bake for 30-35 minutes or until set.
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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Apple + lemontop 14% of all pairsSmell alikemoderateCooked together7,551 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Apple + sugartop 18% of all pairsSmell alikelowCooked together16,478 recipes
Shared aroma: beta-damascenone (apple, rose).
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Lemon + sugartop 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).
Apple and sugar 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
- Apple
- Adds moisture and soft, fruity body to the filling.
- Egg
- Sets as it heats, giving the filling structure and holding it together.
- Lemon juice
- Provides the sharp acidity that defines the lemon flavor.
- Sugar
- Sweetens the filling and balances the lemon's tartness.
- Baking powder
- Releases gas as it heats, helping the filling rise and lighten.
The step that matters
Bake until set. The egg proteins set as the filling heats, so the pie is ready when the center firms rather than when the timer ends. Underbaking leaves a runny filling, while overbaking can make it weep or crack.
Swap the apple
How well each one fits the dish's main ingredients (egg, lemon, sugar):
- Orangefits better
- Vanillafits better
- Limefits better
- Applethe original
Fit is the average pairing score against egg, lemon, 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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