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Dessert

Citron Preserves

Citron preserves are slices of citron boiled in sugar syrup until thick, then cooled.

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. Pare off the rind and seeds from the citron, then cut it into thin slices, about two inches long.

  2. Weigh the sliced citron and place it in a preserving kettle with enough water to cover it.

  3. Boil for one hour, then remove the citron from the kettle.

Make the syrup and preserve

  1. Add an equal weight of sugar to the water in the kettle and boil until thick.

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

  3. Boil for an additional twenty minutes.

  4. Remove the fruit and boil the syrup until it reaches a very thick consistency, similar to molasses.

  5. Pour the thick syrup over the fruit.

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 rind
Forms the main body of the preserve, becoming tender and translucent as it simmers in syrup.
Sugar
Sweetens the preserve and, as the syrup thickens, helps it set and keep.
Lemons
Add acidity and brightness that balance the sweetness of the sugar.

The step that matters

Boiling the syrup to a very thick consistency. Sugar syrup must reach a high concentration to thicken and preserve the fruit. Undercooked syrup stays thin and can spoil, while overcooking can make it hard and sticky.

“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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