Why it works: Corn and flour are a kitchen classic. They rank in the top 13% of all ingredient pairs, and cooks put them together in 6,165 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Lemon Jelly
Ingredients
Directions
Prepare
Rasp the rind of the lemons and mix it with the sugar.
Add the strained juice of the lemons and water, then bring to a boil in an enamelled saucepan.
Mix the corn-flour with cold water to a paste, then add to the boiling mixture.
Set and serve
Boil for 1–2 minutes, then pour into a mould.
For a softer jelly, use half the corn-flour and pour into a glass dish.
Garnish with slices of lemon and green leaves when serving.
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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Corn + flourtop 13% of all pairsSmell alikemoderateCooked together6,165 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Lemon + corntop 13% of all pairsSmell alikemoderateCooked together1,927 recipes
Shared aroma: 2-nonenal (fatty, green).
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Sugar + flourtop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Lemon + flourtop 17% of all pairsSmell alikemoderateCooked together30,404 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Lemon + sugartop 18% of all pairsSmell alikelowCooked together53,532 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
- Corn-flour
- Thickens the lemon liquid into a set, sliceable jelly as it cooks.
- Sugar
- Sweetens the jelly and balances the sharpness of the lemon juice.
- Lemons
- Supply the juice for tartness and the rind for aromatic lemon flavour.
The step that matters
Mix the corn-flour with cold water to a paste before adding it. Corn-flour clumps into lumps if added dry or to hot liquid without first being suspended in cold water. Smoothing it into a paste lets the starch disperse evenly so it thickens the jelly uniformly when it boils.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, corn, flour):
- Raisinfits better
- Vanillafits better
- Blueberryfits better
- Lemonthe original
Fit is the average pairing score against sugar, corn, flour. 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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