Why it works: Flour and butter 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 ↓
Orange Pie
Ingredients
Directions
The book says “a quick oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.
Prepare the filling
Preheat the oven to 400°F (200°C).
Grate the rind of one orange and juice two large oranges.
In a bowl, mix together the sugar and flour.
Add the beaten egg yolks and melted butter to the sugar mixture.
Pour the mixture into a pie crust.
Bake and top
Bake until it resembles a finely baked custard.
Whip the egg whites with the sugar until stiff peaks form.
Spread the whipped egg whites over the pie and return to the oven.
Brown the top slightly before serving.
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 + buttertop 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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Flour + eggtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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Sugar + buttertop 17% of all pairsSmell alikemoderateCooked together98,233 recipes
Shared aroma: guaiacol (smoky, sweet).
Flour and butter 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
- Egg yolks
- Thicken the filling into a custard as they set in the oven.
- Egg whites
- Whipped to stiff peaks, they form a light topping that browns in the oven.
- Sugar
- Sweetens the filling and, whipped with the whites, stabilises the meringue topping.
- Flour
- Helps thicken the filling so it sets rather than running.
- Orange juice
- Provides the main citrus flavour and acidity, with moisture for the custard.
- Butter
- Adds richness and fat, giving the filling a softer, tender texture.
The step that matters
Baking the custard before topping. The filling must be baked until just set. Underbaked, it stays runny and the meringue sinks into it; overbaked, the egg proteins tighten and the custard turns grainy and weeps liquid.
Swap the orange
How well each one fits the dish's main ingredients (sugar, flour, egg, butter):
- Raisinfits better
- Vanillafits better
- Figfits better
- Orangethe original
Fit is the average pairing score against sugar, flour, egg, butter. 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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