Why it works: Apple and lemon are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 7,551 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Apple Custard
Ingredients
Directions
The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.
Make the custard base
In a bowl, combine the stewed and strained apples, sugar, butter, egg yolks, and lemon juice.
Mix until smooth and pour into a baking dish.
Top and bake
In another bowl, beat the egg whites with ½ cup sugar until light and fluffy.
Spread the egg white mixture over the pudding.
Brown slightly in a preheated oven at 350°F (175°C).
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 + lemontop 14% of all pairsSmell alikemoderateCooked together7,551 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Apple + buttertop 14% of all pairsSmell alikemoderateCooked together8,706 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Butter + lemontop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Butter + eggtop 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).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Apples
- Provide the fruit bulk, moisture and tart flavor of the base.
- Egg yolks
- Thicken the base as they set, adding richness and a smooth, creamy texture.
- Egg whites
- Whipped into a foam that bakes into a light, airy topping.
- Butter
- Adds richness and a tender, smooth mouthfeel to the base.
- Sugar
- Sweetens the dish and helps stabilize the whipped egg white foam.
- Lemon juice
- Adds acidity that brightens the sweetness of the apples and custard.
The step that matters
Beating the egg whites. Whites beaten with sugar trap air in a stable foam that gives the topping its light, fluffy texture. Underbeaten whites stay runny and can slide off the custard, while overbeaten whites turn dry and grainy.
Swap the apple
How well each one fits the dish's main ingredients (sugar, butter, egg, lemon):
- Vanillafits better
- Orangefits better
- Raspberryfits better
- Applethe original
Fit is the average pairing score against sugar, butter, egg, lemon. 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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