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Dessert

Lemon Jelly Filling

A citrusy jelly used as a filling for cakes.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Flour and butter are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Lemon Jelly Filling

Ingredients

Directions

Prepare

  1. Grate the yellow rind from the lemons and squeeze out the juice.

  2. In a bowl, mix the sugar and egg yolks.

  3. Add the egg whites and lemon juice.

  4. Pour in the boiling water.

Make the filling

  1. Stir in the flour mixed with ½ cup of water until smooth.

  2. Add the melted butter.

  3. Cook until thickened.

  4. Let it cool.

Use

  1. Spread between layers of 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. Flour + buttertop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Sugar + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

  3. Egg + flourtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

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

  5. Lemon + flourtop 17% of all pairs
    Smell alikemoderate
    Cooked together30,404 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Flour and butter barely smell alike, yet cooks put them together in 124,287 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

Eggs
Egg yolks and whites thicken the filling and give it a rich, set body as it cooks.
Lemons
Juice and rind provide the tart, bright flavour that balances the sweetness.
Sugar
Sweetens the filling and helps give it a smooth, glossy texture.
All-purpose flour
Starch thickens the filling as it cooks, giving it a spreadable consistency.
Butter
Adds fat for a richer mouthfeel and smoother texture in the finished filling.

The step that matters

Cook until thickened. Egg proteins and flour starch must be heated gently and kept moving; overheating can scramble the eggs or leave lumps, while undercooking leaves the filling thin and unset.

Swap the lemon

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

  1. Raisinfits better
  2. Vanillafits better
  3. Figfits about as well
  4. Lemonthe original

Fit is the average pairing score against sugar, egg, flour, 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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