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Dessert

Lemon Curd

A sweet, tart spread made from lemon zest, juice, butter, sugar, and eggs.

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

Ingredients

Directions

Make the curd base

  1. Melt the butter and sugar over very gentle heat.

  2. Stir in the grated rind of the lemons.

  3. Mix in the strained lemon juice until the mixture is smooth and honey-like. Do not let it boil.

Combine and cool

  1. Beat the eggs until well mixed, then strain the beaten eggs.

  2. Gradually add the warm lemon mixture to the eggs and beat hard for several minutes.

  3. Let the mixture cool before using. Do not use it warm.

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 + eggtop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

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

    Shared aroma: guaiacol (smoky, sweet).

  4. Lemon + sugartop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

  5. Lemon + eggtop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

Lemon and sugar 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, silky mouthfeel to the curd.
Lemons
Provide the acidity and aroma that define the curd's flavour, with rind adding fragrance.
Sugar
Sweetens the curd and balances the sharpness of the lemon juice.
Eggs
Thicken the curd as they set gently with heat, giving it body.

The step that matters

Do not let it boil. Once the mixture boils, the egg proteins can scramble and curdle, leaving a grainy texture instead of a smooth, thick curd. Keep the heat very gentle throughout.

Swap the lemon

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

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

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