Why it works: Sugar and lemon 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 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.
Make the filling
Wet the cornstarch with a little cold water.
Pour the boiling water over the cornstarch while stirring well.
Let the mixture cool.
Beat the egg yolks separately.
Mix the beaten yolks with lemon juice and two‑thirds of the sugar.
Add the cornstarch mixture to the yolk mixture.
Stir the combined mixture thoroughly.
Pour the mixture into a pie crust.
Bake and top with meringue
Bake in a 350°F (175°C) oven until the crust is well done.
Beat the egg whites to a stiff froth with the remaining sugar.
Spread the meringue over the pie.
Return the pie to the oven.
Brown the meringue slightly.
Serve cold the same day.
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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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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Sugar + eggtop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
Sugar and lemon 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
- Cornstarch
- Thickens the lemon mixture into a sliceable custard when heated.
- Egg yolks
- Enrich and thicken the filling, giving it a rich, smooth body.
- Egg whites
- Whipped into a stiff foam that forms the airy meringue topping.
- Sugar
- Sweetens the filling and helps stabilise the whipped egg white meringue.
- Lemon juice
- Adds tart acidity that balances the sweetness of the filling.
The step that matters
Let the cornstarch mixture cool before combining with the yolks. Cornstarch needs boiling-hot liquid to swell and thicken, but adding hot liquid straight to beaten yolks can scramble them. Cooling it first lets the yolks blend in smoothly without curdling.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, egg):
- Vanillafits better
- Raisinfits about as well
- Lemonthe original
- Datesfits less well
Fit is the average pairing score against sugar, 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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