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Dessert

Lemon Filling

A buttery lemon filling made by cooking butter, sugar, and lemon juice until thick.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 3 ingredients
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Why it works: Butter and lemon are a kitchen classic. They rank in the top 16% of all ingredient pairs, and cooks put them together in 41,227 recipes. Both carry 3-hexenal, which smells apple, fruity. The science ↓

Lemon Filling

Ingredients

Directions

  1. In a saucepan, combine the butter and sugar.

  2. Add the lemon juice and cook over medium heat.

  3. Stir continuously until the mixture thickens enough to spread.

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. Butter + lemontop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

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

  2. Butter + sugartop 17% of all pairs
    Smell alikemoderate
    Cooked together98,233 recipes

    Shared aroma: guaiacol (smoky, sweet).

  3. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

    Shared aroma: 2-nonenal (fatty, green).

Sugar and lemon barely smell alike, yet cooks put them together in 53,532 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

Butter
Adds richness and a smooth, glossy body to the filling.
Sugar
Sweetens the filling and helps give it a thick, spreadable texture as it cooks.
Lemon juice
Provides the tart acidity that defines the filling and helps it set as it thickens.

The step that matters

Stir continuously while it thickens. Stirring keeps the sugar and butter evenly dispersed and prevents the mixture from scorching on the bottom of the pan. Constant motion also helps the mixture thicken smoothly rather than forming lumps or burning in spots.

Swap the lemon

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

  1. Vanillafits better
  2. Figfits better
  3. Peachfits better
  4. Lemonthe original

Fit is the average pairing score against butter, 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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