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 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Make the filling
Grate the lemon zest, avoiding the bitter white part, and squeeze out the juice.
Combine grated lemon, cornstarch, sugar, butter, and hot water in a double boiler.
Cook the mixture until thickened.
Remove the mixture from heat and let it cool slightly.
Stir in the egg yolks.
Assemble and bake
Pre‑bake the pie crust until golden.
Pour the lemon filling into the crust.
Set aside the egg whites for meringue.
Whip the egg whites until stiff.
Gradually add pulverized sugar to the whipped egg whites.
Spread the meringue over the lemon filling.
Bake at 400°F (200°C) for a few minutes until 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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Walnut + buttertop 15% of all pairsSmell alikemoderateCooked together6,832 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
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Lemon + buttertop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Butter + eggtop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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Sugar + buttertop 17% of all pairsSmell alikemoderateCooked together98,233 recipes
Shared aroma: guaiacol (smoky, sweet).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Egg yolks
- Thicken the filling and add richness to the custard.
- Egg whites
- Whip into a stiff foam that forms the meringue topping.
- Cornstarch
- Thickens the lemon mixture as it cooks.
- Lemon
- Provides the acidity and aroma that flavor the filling.
- Sugar
- Sweetens the filling and helps stabilize the meringue.
The step that matters
Cook the filling until thickened. Cornstarch only thickens fully once the mixture reaches a boil and is held there briefly; undercooked starch leaves a thin, runny filling. Stirring gently in a double boiler helps prevent scorching and lumps.
Swap the walnut
How well each one fits the dish's main ingredients (lemon, sugar, butter, egg):
- Almondfits better
- Pistachiofits about as well
- Walnutthe original
- Milletfits about as well
Fit is the average pairing score against lemon, sugar, 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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