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 Jelly
Ingredients
Directions
Prepare
Remove the rind and pith from one lemon, grate the rind into a bowl, and squeeze the juice from the other lemons into it.
In a saucepan, combine the sugar and water, and boil until it forms a stiff syrup.
Remove from heat and add the lemon juice and grated rind.
Cover the saucepan and return it to the heat.
Clarify
When it begins to boil again, skim it carefully.
Gradually add ⅓ cup of water to clarify the mixture.
Let it boil for another minute.
Add the dissolved isinglass or calf's feet jelly and stir well.
Pass the mixture through a jelly bag to strain.
Unmold
To remove the jelly from the mold, dip the mold in lukewarm water, gently strike it, and turn it over onto a dish.
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 + 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
- Lemons
- Provide the sharp acidity and the aromatic oil from the grated rind that flavour the jelly.
- Sugar
- Sweetens the jelly and, boiled with water, forms the syrup that gives it body.
- Isinglass or calf's feet jelly
- Acts as the gelling agent that sets the lemon mixture into a firm jelly.
The step that matters
Skimming the mixture carefully. When it returns to the boil, foam and impurities rise to the surface. Removing them clarifies the liquid, so the finished jelly is clear rather than cloudy.
“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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