Why it works: Lemon and sugar 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 Cream Pie
Ingredients
Directions
Make the filling
Zest the lemon, removing the white pith, and chop the remaining lemon finely.
In a bowl, stir cornstarch into boiling water until dissolved, then boil.
Add white sugar and a pinch of salt to the mixture and let it cool.
Once cooled, mix in the beaten yolks of two eggs.
Bake and finish
Prepare a rich paste and bake it in a pie crust.
When the pie is cool, top it with beaten egg whites mixed with powdered sugar until stiff.
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.
-
Lemon + sugartop 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).
-
Sugar + eggtop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
Lemon and sugar 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
- Lemon
- Adds tart acidity and bright citrus aroma that balance the sweetness of the filling.
- Cornstarch
- Thickens the boiled liquid so the filling sets into a firm, sliceable cream.
- Egg yolks
- Enrich the filling and add richness, color and body as they set.
- White sugar
- Sweetens the filling and offsets the sharpness of the lemon.
- Egg whites
- Whipped with powdered sugar, they form a light, stable meringue topping.
- Pie crust
- Holds the filling in shape and gives the pie its base structure.
The step that matters
Beat the egg whites until stiff before topping the pie. Whites whipped with sugar form a stable foam only when fully beaten to stiff peaks. Underbeaten whites collapse or weep, and spreading them onto a warm filling can cause beads of liquid to form.
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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