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
Bake the pie crust until golden.
In a saucepan, combine cold water, beaten egg yolks, cornstarch, sugar, grated lemon rind, and lemon juice.
Cook the mixture over medium heat until thickened.
Pour the lemon filling into the baked crust.
Make the meringue and bake
Beat egg whites until stiff.
Gradually add sugar to sweeten.
Spread the meringue over the lemon filling.
Brown in a 350°F (175°C) 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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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).
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
- Egg yolks
- Thicken the filling and enrich it, setting into a smooth, creamy custard when cooked.
- Cornstarch
- Thickens the lemon filling as it heats, giving it a sliceable, glossy body.
- Sugar
- Sweetens the filling and, dissolved into the egg whites, stabilizes the meringue.
- Lemon juice
- Adds acidity that brightens the filling and balances the sweetness.
- Egg whites
- Whipped into foam, they form the airy structure of the meringue that browns in the oven.
The step that matters
Cook the filling until thickened. Cornstarch only thickens fully when the mixture reaches a boil and is held there briefly; undercooked filling stays runny and will weep or fail to set once cooled. Egg yolks also need gentle, steady heat to thicken without curdling.
Swap the lemon
How well each one fits the dish's main ingredients (egg, sugar):
- Vanillafits better
- Raisinfits about as well
- Lemonthe original
- Datesfits less well
Fit is the average pairing score against egg, 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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