Why it works: Sugar and flour are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 92,116 recipes. Both carry phenylacetaldehyde, which smells hawthorne, honey. The science ↓
Lemon Cream Pie
Ingredients
Directions
The book says “a very slow oven”. The 300°F (150°C) in the steps is the modern equivalent, not the book's own figure.
Make the custard
Beat the yolks and whites of the eggs separately.
To the beaten yolks, add sugar, flour, lemon juice, lemon rind, and boiling water.
Cook in a double boiler until it thickens, then stir in half of the beaten egg whites.
Continue cooking until thickened to your liking.
Assemble and bake
Fill the baked pie shell with the custard and set aside to cool.
For the meringue, beat the egg whites until stiff, gradually adding icing sugar.
Spread the meringue over the cooled filling and brown slightly in a 300°F (150°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 + flourtop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Flour + eggtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + lemontop 17% of all pairsSmell alikemoderateCooked together30,404 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Sugar + lemontop 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).
Flour and egg barely smell alike, yet cooks put them together in 106,462 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 custard while whites add lightness to the filling and form the stiff meringue topping.
- Flour
- Starch thickens the lemon custard so it sets into a sliceable filling.
- Sugar
- Sweetens the custard and helps stabilise the meringue as it is beaten.
- Lemon juice
- Provides acidity that brightens the custard and balances its sweetness.
The step that matters
Cooking the custard until thickened. Starch needs to be fully cooked to thicken properly; undercooked flour leaves the filling thin and pasty, and the egg yolks must be heated gently in a double boiler to avoid curdling.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, flour, egg):
- Raisinfits better
- Vanillafits better
- Lemonthe original
- Figfits about as well
Fit is the average pairing score against sugar, flour, 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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