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 ↓
A Very Rich Lemon Pie
Ingredients
Directions
Prepare
Grate the yellow part of the lemon rind and squeeze the juice.
Beat the butter and sugar together until creamy with the egg yolks.
Make the filling
Stir in the grated rind, lemon juice, flour, and brandy.
Whip the egg whites and gently fold them into the mixture.
Bake
Bake in a pie crust.
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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Butter + brandytop 15% of all pairsSmell alikemoderateCooked together5,127 recipes
Shared aroma: ethyl octanoate (fruity, wine).
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Egg + flourtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Lemon + buttertop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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 enrich and thicken the filling, while whipped whites add air and lightness.
- Butter
- Adds fat for richness and a tender texture.
- Sugar
- Sweetens the filling and, creamed with butter, helps build a smooth texture.
- Lemon
- Juice adds acidity and the rind adds bright citrus aroma.
- Flour
- Thickens the filling and gives it body so it holds its shape.
- Brandy
- Adds aroma and depth of flavor to the filling.
The step that matters
Folding in the whipped egg whites. Whipped whites hold air bubbles that give the filling lift and lightness. Folding gently keeps those bubbles from collapsing, while vigorous stirring deflates them and makes the pie dense.
Swap the lemon
How well each one fits the dish's main ingredients (butter, sugar, egg, flour, brandy):
- Raisinfits better
- Vanillafits better
- Figfits better
- Lemonthe original
Fit is the average pairing score against butter, sugar, egg, flour, brandy. 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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