Why it works: Lemon and walnut match in chemistry and in kitchens. They rank in the top 10% of all ingredient pairs, and cooks put them together in 2,149 recipes. Both carry 2-nonenal, which smells fatty, green. 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 the filling
Preheat the oven to 350°F (175°C).
In a bowl, mix the grated lemon rind, lemon juice, sugar, flour, and butter until smooth. Add the whole eggs and mix well.
Bake and finish
Pour the mixture into a pie crust and bake for 25-30 minutes.
Whip the egg whites until stiff peaks form and spread over the pie.
Return the pie to the oven for an additional 5-10 minutes until the frosting is lightly browned.
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 + walnuttop 10% of all pairsSmell alikestrongCooked together2,149 recipes
Shared aroma: 2-nonenal (fatty, green).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + walnuttop 12% of all pairsSmell alikemoderateCooked together5,873 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Sugar + flourtop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Walnut + buttertop 15% of all pairsSmell alikemoderateCooked together6,832 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
Flour and butter barely smell alike, yet cooks put them together in 124,287 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
- Bind the filling and help it set into a sliceable custard as it bakes.
- Sugar
- Sweetens the filling and balances the sharp acidity of the lemon juice.
- Lemon juice
- Provides the sharp, acidic lemon flavour that defines the filling.
- Flour
- Thickens the filling so it holds its body while baking.
- Egg whites
- Whipped into a stiff foam that forms the frosting and browns in the oven.
The step that matters
Whipping the egg white frosting. Egg whites must be beaten to stiff peaks so the foam holds its shape and spreads over the pie. Under-whipped whites collapse and weep, while the final browning step needs only a short time to avoid overcooking the filling beneath.
Swap the walnut
How well each one fits the dish's main ingredients (lemon, sugar, flour, butter, egg):
- Almondfits better
- Pistachiofits better
- Milletfits better
- Walnutthe original
Fit is the average pairing score against lemon, sugar, flour, butter, 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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