Why it works: Butter and flour are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, 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
Combine sugar, egg yolks, water, melted butter, flour, lemon juice, and lemon zest in a saucepan.
Cook over medium heat until thickened.
Pour the mixture into a pie crust.
Bake and top with meringue
Bake at 350°F (175°C) for 35 to 40 minutes.
Beat egg whites until soft peaks form.
Gradually add 1 tablespoon of sugar and continue beating until stiff peaks form.
Spread the meringue over the baked pie.
Return to the oven 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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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Sugar + flourtop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Egg + flourtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + lemontop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Flour + lemontop 17% of all pairsSmell alikemoderateCooked together30,404 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour barely smell alike, yet cooks put them together in 124,287 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
- Eggs
- Yolks thicken the filling, and whites whip into the meringue topping for lift and structure.
- Flour
- Starch thickens the lemon filling as it cooks, giving it a sliceable body.
- Sugar
- Sweetens the filling and helps stabilise the whipped egg white meringue.
- Butter
- Adds richness and a smoother texture to the filling.
- Lemon
- Provides the acidity and aroma that give the filling its bright flavour.
The step that matters
Cook the filling until thickened. The flour starch must be fully cooked to thicken the filling. If it is underheated, the pie will be runny and may not hold a clean slice after cooling.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, egg, butter, flour):
- Raisinfits better
- Vanillafits better
- Figfits about as well
- Lemonthe original
Fit is the average pairing score against sugar, egg, butter, flour. 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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