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Dessert

Apple Filling

A sweet apple filling made with grated tart apples, lemon juice and rind, and sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 3 ingredients
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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 Filling

Ingredients

Directions

Make the filling

  1. In a saucepan, combine the grated apple, lemon juice, lemon rind, and sugar.

  2. Cook over medium heat until thickened.

  3. Let the mixture cool.

Assemble the cake

  1. Spread the filling between the layers of your cake.

  2. Dust the top of the cake with sugar.

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. Apple + lemontop 14% of all pairs
    Smell alikemoderate
    Cooked together7,551 recipes

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

  2. Apple + sugartop 18% of all pairs
    Smell alikelow
    Cooked together16,478 recipes

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

  3. Lemon + sugartop 18% of all pairs
    Smell alikelow
    Cooked 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

Tart apple
Provides the bulk of the filling and its tart flavor, which balances the sweetness.
Sugar
Sweetens the filling and, as it cooks, helps thicken it into a spreadable mass.
Lemon
Adds acidity and aroma; the juice brightens the apple and the rind adds fragrant oils.

The step that matters

Cook until thickened. Apples release water as they heat. Cooking drives off moisture and lets the pectin and sugar set the mixture, so it stays between cake layers instead of soaking into them.

Swap the lemon

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

  1. Pearfits better
  2. Vanillafits better
  3. Apricotfits better
  4. Lemonthe original

Fit is the average pairing score against apple, 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.

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