Why it works: Apple and milk are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 4,104 recipes. Both carry 4-heptenal, which smells creamy, biscuit. The science ↓
Apple Custard
Ingredients
Directions
Prepare the apples
Peel and core the apples, then boil them in clear water until tender.
Remove the apples and mash them through a sieve until smooth.
Add the sifted sugar and grated lemon rind to the apple pulp and mix well.
Pour the mixture into a deep dish, filling it halfway.
Make the custard
In a separate bowl, beat the egg yolks and add the white sugar.
Stir the mixture into the sweet milk.
Heat over the fire until thickened, then let it cool.
Assemble and top
Once cooled, pour the thickened milk mixture over the apples.
Whip the egg whites to stiff peaks and spread them over the top.
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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Apple + milktop 11% of all pairsSmell alikemoderateCooked together4,104 recipes
Shared aroma: 4-heptenal (creamy, biscuit).
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Apple + lemontop 14% of all pairsSmell alikemoderateCooked together7,551 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Lemon + milktop 15% of all pairsSmell alikemoderateCooked together19,053 recipes
Shared aroma: 2-nonenal (fatty, green).
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Apple + sugartop 18% of all pairsSmell alikelowCooked together16,478 recipes
Shared aroma: beta-damascenone (apple, rose).
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Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
Apple and sugar barely smell alike, yet cooks put them together in 16,478 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
- Apples
- Provide the bulk and tart fruit flavour, and softened pulp that forms the base layer.
- Egg yolks
- Thicken the custard as they set with gentle heat, giving it a rich texture.
- Sweet milk
- Forms the liquid base of the custard, which thickens when heated.
- Whites of 4 eggs
- Whipped to stiff peaks to form a light topping that adds airy structure.
- Sifted sugar
- Sweetens the apple pulp and balances the tartness of the fruit.
The step that matters
Heating the custard until thickened. Egg yolks thicken as their proteins set with heat, but overheating can curdle them. Heat gently and stir, then let it cool before pouring over the apples.
Swap the apple
How well each one fits the dish's main ingredients (sugar, lemon, egg, milk):
- Vanillafits better
- Orangefits better
- Figfits better
- Applethe original
Fit is the average pairing score against sugar, lemon, egg, milk. 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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