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Lemon Jelly Filling

A lemon-flavored jelly used as a cake filling.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 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 ↓

Lemon Jelly Filling

Ingredients

Directions

Prepare

  1. Grate the apple and lemon rind.

Make the lemon jelly

  1. Mix the grated apple, lemon rind, lemon juice, sugar, and butter together.

  2. Cook in a double boiler until thickened and amber in color.

  3. Let it cool, then spread on cake.

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 + buttertop 14% of all pairs
    Smell alikemoderate
    Cooked together8,706 recipes

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

  3. Lemon + buttertop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

    Shared aroma: 3-hexenal (apple, fruity).

  4. Sugar + buttertop 17% of all pairs
    Smell alikemoderate
    Cooked together98,233 recipes

    Shared aroma: guaiacol (smoky, sweet).

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

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

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
Adds pectin and body, helping the mixture thicken as it cooks.
Sugar
Sweetens the mixture and, as it cooks, helps build the thick, amber texture.
Lemon juice
Provides acidity that brightens the flavor and balances the sweetness.
Butter
Adds fat for a smooth, rich mouthfeel and a silkier set.

The step that matters

Cooking in a double boiler until thickened. Gentle indirect heat lets the mixture thicken slowly without scorching or curdling. Cooking too hot can burn the sugar and make the texture grainy, so watch for thickening and amber color rather than rushing.

Swap the lemon

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

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

Fit is the average pairing score against apple, sugar, butter. 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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