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Dessert

Apple Filling

A custard made from apples, sugar, lemon, and egg, used as a filling for cakes.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Lemon and almond match in chemistry and in kitchens. They rank in the top 10% of all ingredient pairs, and cooks put them together in 5,655 recipes. Both carry eucalyptol, which smells eucalyptus, herbal. The science ↓

Apple Filling

Ingredients

Directions

Prepare the custard

  1. Preheat the oven as for a jelly cake.

  2. Beat the egg in a bowl until light.

  3. Add the sugar, lemon juice, and grated lemon rind to the egg and mix well.

  4. Grate the apples directly into the mixture, stirring well after each addition.

  5. Transfer the mixture to a saucepan and cook over medium heat until it boils and thickens.

Finish

  1. Cool the apple custard and spread it between the cakes.

Recipe from a historical cookbook (Internet Archive).

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.

  1. Lemon + almondtop 10% of all pairs
    Smell alikestrong
    Cooked together5,655 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

  2. Lemon + appletop 14% of all pairs
    Smell alikemoderate
    Cooked together7,551 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  3. Apple + almondtop 15% of all pairs
    Smell alikemoderate
    Cooked together1,025 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  4. Sugar + almondtop 18% of all pairs
    Smell alikemoderate
    Cooked together15,679 recipes

    Shared aroma: 1-penten-3-one (fish, pungent).

  5. Sugar + appletop 18% of all pairs
    Smell alikelow
    Cooked together16,478 recipes

    Shared aroma: beta-damascenone (apple, rose).

Sugar and apple 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

Egg
Thickens the custard as it cooks and gives it body.
Sugar
Adds sweetness and helps balance the tartness of the apples and lemon.
Lemon
Adds acidity and fresh aroma that brighten the sweet custard.
Tart apples
Provide the main body and flavor of the custard.

The step that matters

Cooking the custard until it boils and thickens. Egg proteins set as the mixture heats, thickening it. Stopping too early leaves it runny, while overheating can cause the egg to curdle, so stir steadily over medium heat.

Swap the apple

How well each one fits the dish's main ingredients (egg, sugar, lemon, almond):

  1. Vanillafits better
  2. Orangefits better
  3. Raisinfits better
  4. Applethe original

Fit is the average pairing score against egg, sugar, lemon, almond. 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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