Why it works: Milk and flour 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 ↓
Custard Pie
Ingredients
Directions
The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Make the custard
Scald the milk in a heatproof bowl set over boiling water.
In a separate bowl, beat the egg yolks with flour and sugar.
Stir the egg mixture into the scalded milk and cook until thick.
Add lemon juice to the mixture and pour it into the pre-baked pie crust.
Top and bake
Beat the egg whites until soft peaks form, then gradually add ½ cup sugar until stiff peaks form.
Spread the meringue over the custard and bake in a 400°F (200°C) oven for a few minutes to harden.
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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Milk + flourtop 14% of all pairsSmell alikelowCooked together78,219 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + sugartop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Milk + lemontop 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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Flour + lemontop 17% of all pairsSmell alikemoderateCooked together30,404 recipes
Shared aroma: isobutyraldehyde (malty, green).
Milk and flour 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
- Yolks thicken the custard and whites whip into the meringue that tops the pie.
- Milk
- Provides the liquid base that sets into the custard.
- Flour
- Stabilizes the custard so it thickens without becoming grainy or runny.
- Sugar
- Sweetens the custard and, dissolved into the whites, stabilizes the meringue.
The step that matters
Cooking the custard until thick. Egg yolks thicken as they heat, but if the mixture gets too hot it can curdle or scramble. Cook gently and stir constantly until it coats the spoon, then remove from heat.
Swap the lemon
How well each one fits the dish's main ingredients (milk, egg, flour, sugar):
- Vanillafits better
- Raisinfits better
- Figfits better
- Lemonthe original
Fit is the average pairing score against milk, egg, flour, sugar. 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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