Why it works: Lemon and butter 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 ↓
Suitable for Sandwich Cakes or Pastry
Ingredients
Directions
Prepare
Grate the rind and squeeze the juice of the lemons.
Make the curd
In a brass pan, mix the lemon juice, grated rind, sugar, butter, and eggs.
Stir the mixture over low heat until it thickens, but do not boil.
Pour the mixture into pots and cover.
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.
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Lemon + buttertop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Butter + eggtop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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Butter + sugartop 17% of all pairsSmell alikemoderateCooked together98,233 recipes
Shared aroma: guaiacol (smoky, sweet).
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Lemon + sugartop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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Lemon + eggtop 19% of all pairsSmell alikelowCooked 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
- Eggs
- Yolks and whites thicken the mixture as it heats, setting it into a smooth curd.
- Butter
- Adds richness and a silky texture to the curd.
- Sugar
- Sweetens the curd and balances the sharpness of the lemon.
- Lemons
- Provide the juice and rind that give the curd its bright, acidic flavour and aroma.
The step that matters
Stir over low heat without boiling. Egg proteins thicken the mixture gently as it warms. If it boils, the eggs can scramble and the curd turns grainy and loses its smooth texture.
Swap the lemon
How well each one fits the dish's main ingredients (butter, sugar, egg):
- Vanillafits better
- Lemonthe original
- Raisinfits about as well
- 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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