Why it works: Milk and butter are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Lemon Custard Pie
Ingredients
Directions
The book says “a moderate oven”. The 350°F in the steps is the modern equivalent, not the book's own figure.
Prepare the crust
Line a deep pie plate with rich pastry.
Bake until light brown.
Make the custard
Heat 1 cup of milk in a double boiler.
Dissolve 1 tablespoon of flour in a little water and stir into the milk until thick.
Add 1 tablespoon of butter and remove from heat.
Stir in the grated rind and juice of 2 lemons.
Beat 4 egg yolks with ¼ cup of sugar and add to the mixture.
Fill the pie plate with the mixture and bake in a moderate oven (350°F / 175°C) until set.
Cool the pie.
Add the meringue
Beat the 4 egg whites and mix in 3 tablespoons of powdered sugar.
Spread the meringue over the cooled pie and brown lightly 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.
-
Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Milk + flourtop 14% of all pairsSmell alikelowCooked together78,219 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Flour + sugartop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
-
Milk + lemontop 15% of all pairsSmell alikemoderateCooked together19,053 recipes
Shared aroma: 2-nonenal (fatty, green).
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 custard and add richness as they set with heat.
- Flour
- Thickens the milk so the custard holds its shape when cut.
- Milk
- Forms the liquid base that the yolks and flour set into custard.
- Lemons
- Add sharp acidity and bright citrus aroma that balance the sugar.
- Egg whites
- Whipped into a foam that gives the meringue its light structure.
- Sugar
- Sweetens the custard and helps stabilize the whipped egg whites.
The step that matters
Baking the custard until set. Egg yolks thicken as their proteins coagulate with heat. Underbaked custard stays runny and won't hold its shape, while overbaking can make it curdle or weep liquid.
Swap the lemon
How well each one fits the dish's main ingredients (milk, flour, butter, egg, sugar):
- Vanillafits better
- Raisinfits better
- Figfits better
- Lemonthe original
Fit is the average pairing score against milk, flour, butter, egg, 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.
You might also like
Lemon Cake228 recipes
Lemon Ice147 recipes
Lemon Sherbet103 recipes
Lemon Custard64 recipesThe free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.