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 ↓
Lemon Custard
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.
Make the custard
Beat the sugar and egg yolks together.
Add the juice and rind of the lemon.
Gradually mix the flour with the milk, stirring continuously.
Pour the milk mixture through a sieve into the egg and sugar mixture.
Bake
Line a deep pie plate with puff pastry.
Pour in the mixture and bake at 400°F (200°C) for 30 minutes.
Make and spread the meringue
Beat the egg whites, gradually adding 3 tablespoons of powdered sugar until stiff and glossy.
Spread the meringue over the top of the custard.
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.
Photo for illustrative purposes only · Contact us to use it
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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Sugar + flourtop 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 as they set; whipped whites give the meringue its structure.
- Flour
- Starch thickens the milk mixture so the custard holds its body.
- Milk
- Provides the liquid that sets with the eggs into a soft custard.
- Sugar
- Sweetens the custard and stabilises the whipped egg whites in the meringue.
- Lemon
- Juice adds acidity and rind adds aroma that brightens the custard.
The step that matters
Beating the egg whites until stiff and glossy. Beating unfolds egg white proteins and traps air, forming a foam that holds its peaks. Underbeaten whites collapse and weep under the custard, while overbeaten whites turn dry and grainy. Adding sugar gradually helps the foam stay stable.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, egg, milk, flour):
- Vanillafits better
- Raisinfits better
- Figfits better
- Lemonthe original
Fit is the average pairing score against sugar, egg, milk, flour. 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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