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To Preserve Citrons

A method for preserving citrons by boiling them with sugar and ginger to create a syrup.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Sugar and ginger are a kitchen classic. They rank in the top 17% of all ingredient pairs, and cooks put them together in 14,054 recipes. Both carry 1-penten-3-one, which smells fish, pungent. The science ↓

To Preserve Citrons

Ingredients

Directions

Prepare the citrons

  1. Soak the citrons in water overnight.

  2. Boil the citrons until tender enough to run a straw through them.

  3. Cut the citrons in half and remove the pulp, leaving the rind intact.

Make the syrup

  1. Place the citrons in a bowl and cover with double refined sugar for 2-3 days.

  2. Boil the sugar, citrons, and 2-3 tablespoons of water together for 15 minutes.

  3. After 2 days, pour off the syrup and boil it with 1 pound of sugar.

  4. Skim the syrup and pour it boiling hot over the citrons.

  5. If the syrup is not rich enough, repeat the boiling process.

Add the ginger and store

  1. Soak the ginger in water for 3 days, scrape it, and boil in a thin syrup.

  2. Add the ginger to the preserving syrup when boiling for the last time.

  3. Once cooled, cover the mixture with paper and bladder.

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 + gingertop 17% of all pairs
    Smell alikelow
    Cooked together14,054 recipes

    Shared aroma: 1-penten-3-one (fish, pungent).

Sugar and ginger barely smell alike, yet cooks put them together in 14,054 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

Citrons
The rind is the main edible part, and boiling and syruping soften it and make it sweet and translucent.
Double refined sugar
Sugar draws water out of the rind and builds a thick syrup that preserves the fruit and adds sweetness.
White ginger
Adds a warm, spicy aroma that contrasts with the sweet citrus rind.

The step that matters

Repeating the syrup boil until rich enough. Sugar must penetrate the rind and reach a high concentration to preserve the citrons. Syrup that is too thin can let the fruit spoil, so checking richness and reboiling matters.

“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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