Why it works: Sugar and cream are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 43,450 recipes. Both carry 2,3-butanedione, which smells butter, sweet. The science ↓
Lemon Jelly
Ingredients
Directions
Make the lemon base
Soak the gelatine in ½ cup of cold water for one hour.
Add the boiling water and sugar to the soaked gelatine, stirring until dissolved.
Mix in the grated lemons and place the mixture on the stove until it thickens.
Add the custard and set
Beat the egg yolks and combine with the warm milk, cooking gently until thickened like custard.
Fold the egg mixture into the gelatine mixture and add enough whipped cream to taste.
Pour into a mold and refrigerate until set.
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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Sugar + creamtop 9% of all pairsSmell alikemoderateCooked together43,450 recipes
Shared aroma: 2,3-butanedione (butter, sweet).
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Lemon + milktop 15% of all pairsSmell alikemoderateCooked together19,053 recipes
Shared aroma: 2-nonenal (fatty, green).
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Milk + creamtop 18% of all pairsSmell alikemoderateCooked together29,399 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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Egg + milktop 18% of all pairsSmell alikemoderateCooked together88,785 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
- Gelatine
- Sets the mixture into a firm, sliceable jelly as it cools.
- Egg yolks
- Thicken the custard and add richness and a smooth, creamy body.
- Sugar
- Sweetens the jelly and balances the sharpness of the lemon.
- Grated lemons
- Provide the main lemon aroma and sharp, acidic flavour.
- Whipped cream
- Adds fat, lightness and a softer, creamier texture to the set jelly.
The step that matters
Cooking the egg yolk custard gently. Egg yolks thicken when heated, but if they get too hot they scramble and turn grainy. Cooking slowly over low heat, stirring, keeps the custard smooth before it is folded into the gelatine.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, egg, milk, cream):
- Vanillafits better
- Strawberryfits better
- Raspberryfits better
- Lemonthe original
Fit is the average pairing score against sugar, egg, milk, cream. 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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