Why it works: Flour and milk are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 78,219 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Lemon Pie
Ingredients
Directions
The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.
Prepare
Preheat the oven to 350°F (175°C).
Line a medium-sized pie plate with pastry.
Make the filling
In a bowl, mix the lemon juice, grated rind, sugar, eggs, flour, and enough milk to fill the pie plate.
Pour the mixture into the prepared pie crust and bake until set, about 40 minutes.
Make the meringue and finish
Beat the egg whites to stiff peaks, then gradually add 4 tablespoons of powdered sugar.
Spread the meringue over the baked pie and lightly brown 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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Flour + milktop 14% of all pairsSmell alikelowCooked together78,219 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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Lemon + milktop 15% of all pairsSmell alikemoderateCooked together19,053 recipes
Shared aroma: 2-nonenal (fatty, green).
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Egg + flourtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Lemon + flourtop 17% of all pairsSmell alikemoderateCooked together30,404 recipes
Shared aroma: isobutyraldehyde (malty, green).
Flour and milk barely smell alike, yet cooks put them together in 78,219 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
- Set the filling custard as they cook, giving the pie its body.
- Egg whites
- Whipped to stiff peaks, they form the airy structure of the meringue topping.
- Sugar
- Sweetens the filling and helps stabilise the whipped egg white meringue.
- Lemon juice
- Adds acidity that gives the filling its tart flavour.
- Flour
- Thickens the filling so it sets rather than staying runny.
The step that matters
Baking the filling until set. Underbaking leaves the egg-thickened filling runny, while overbaking can make it weep or crack. The filling should be set but still gently wobble in the centre.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, egg, flour, milk):
- Vanillafits better
- Raisinfits better
- Figfits better
- Lemonthe original
Fit is the average pairing score against sugar, egg, flour, milk. 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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