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Dessert

Citron Preserves

Citron preserves are made by boiling citron with water, sugar, and lemon slices until tender, then jarred with syrup.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Sugar and lemon 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 ↓

Citron Preserves

Ingredients

Directions

Prepare the citron

  1. Peel the rind from the citron and remove the seeds.

  2. Cut the citron into desired shapes and weigh it.

Cook the citron

  1. Place the citron in a preserving kettle and cover with water.

  2. Boil for one hour, then remove the citron.

  3. Add an equal weight of sugar to the water in the kettle and boil until it forms a thick syrup.

  4. Return the citron to the kettle and add two sliced lemons for each pound of citron.

  5. Boil until the fruit is tender and clear.

Jar and seal

  1. Transfer the fruit to small jars and pour the thick syrup over it, then seal the jars.

Recipe from a historical cookbook (Internet Archive).

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.

  1. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 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

Citron
Provides the main fruit body and rind that becomes tender and translucent during simmering.
Sugar
Sweetens the preserve and thickens the syrup, helping the fruit keep its shape and preserve well.
Lemons
Add acidity and brightness that balance the sweetness and help set the syrup.

The step that matters

Boil until the fruit is tender and clear. Stop too early and the citron stays firm and cloudy; cook too long and it breaks down. The fruit turns translucent as sugar syrup replaces water in its cells, so judge by clarity and texture.

“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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