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Dessert

Preserved Citron

A preserved citron made by salting, sugaring, and cooking the fruit until syrupy.

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

  1. Cut the citron into slices and remove the seeds.

  2. Cut the slices into small squares and weigh them.

  3. Soak the citron squares in water with dissolved coarse sea salt.

Cook the citron

  1. Cook until you can pass a straw through the pieces.

  2. Pour off the water and add ¾ pound of white sugar for each pound of citron.

  3. Cook slowly until the syrup thickens like molasses.

  4. Remove from heat and stir in lemon extract to taste.

Store

  1. Transfer to a jar, cover tightly, and store in a cool, dry place.

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 body and bitter-tart peel flavour that the preserve is built around.
White sugar
Sweetens and thickens the syrup as it cooks down, helping preserve the fruit.
Coarse sea salt
Softens the citron during soaking and seasons the fruit before the sugar is added.

The step that matters

Cooking the syrup slowly. Cooking too fast or too hot can scorch the sugar and make the syrup bitter before it thickens. Slow cooking lets water evaporate evenly so the syrup thickens without burning.

“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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