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Dessert

Preserved Citron

A preserved citron made by boiling citron with water, sugar, and lemons, then reducing to a thick 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 ↓

Preserved Citron

Ingredients

Directions

Prepare the citron

  1. Do not completely cover the citron with water.

  2. Boil for one hour, then strain.

Make the syrup

  1. Use an equal amount of sugar as citron.

  2. Make a moderate syrup.

  3. Add two lemons for every pound of citron.

Finish and pour

  1. Boil for twenty minutes, then strain again.

  2. Make a thick syrup and pour it over the citron.

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
The main fruit, whose rind softens during boiling and absorbs the sweet syrup.
Sugar
Sweetens the fruit and, at high concentration, draws out water and helps preserve it.
Lemons
Add acidity and brightness that balance the sweetness of the syrup.

The step that matters

Make a thick syrup and pour it over the citron. Sugar must be dissolved and concentrated enough to draw water out of the fruit and slow spoilage. A syrup that is too thin will not preserve the citron well or give it a firm, glossy 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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