Why it works: Lemon and sugar are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 53,532 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓
Lemon Custard
Ingredients
Directions
Make the custard
Juice the lemons and grate the rind of one lemon.
In a porcelain saucepan, combine the lemon juice, grated rind, yolks of the eggs, and sugar.
Place the saucepan in a pan of boiling water on the stove.
Stir constantly until it bubbles.
Finish and serve
Beat the egg whites until stiff and gently fold them into the custard.
Pour the mixture into a glass dish or custard cups.
Serve cold.
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.
Photo for illustrative purposes only · Contact us to use it
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 + 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).
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Egg + sugartop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
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 thicken the custard as they cook, and whites beaten to stiff peaks give it a light, airy texture.
- Lemons
- Juice and rind supply the acidity and bright aroma that define the custard's flavor.
- Sugar
- Sweetens the custard and balances the sharpness of the lemon juice.
The step that matters
Stir constantly until it bubbles. Egg yolks set as they heat, and if they overheat or are left unstirred they can curdle or turn grainy. Constant stirring over gentle heat keeps the custard smooth and evenly thickened.
Swap the lemon
How well each one fits the dish's main ingredients (egg, sugar):
- Vanillafits better
- Raisinfits about as well
- Lemonthe original
- Datesfits less well
Fit is the average pairing score against egg, 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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