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
Make the filling
Mix sugar, cornstarch, lemon juice, and egg yolks in a bowl until smooth.
Pour the mixture over 1 cup of boiling water and stir until thickened.
Prepare the crust
Pre‑bake the pie crust, pricking it well with a fork.
Top and bake
Frost the egg whites with sugar and flavoring.
Spread the frosted egg whites over the filling.
Brown the topping lightly in the oven.
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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Lemon + eggtop 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
- Sugar
- Sweetens the filling and helps create the body of the custard.
- Cornstarch
- Thickens the filling as it heats with the boiling water.
- Lemon juice
- Adds acidity and bright lemon flavor to balance the sweetness.
- Egg yolks
- Add richness and help set the filling into a smooth custard.
The step that matters
Stir the filling until thickened. Cornstarch must be heated fully in the liquid to swell and thicken. Undercooked starch leaves the filling thin and runny, while the egg yolks need steady heat to thicken 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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