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Citron Preserved

A preserved citron made by boiling slices in water with alum, then simmering in a ginger‑sugar syrup.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Ginger and lemon match in chemistry and in kitchens. They rank in the top 5% of all ingredient pairs, and cooks put them together in 5,154 recipes. Both carry beta-phellandrene, which smells minty, terpene. The science ↓

Citron Preserved

Ingredients

Directions

Prepare the citron

  1. Cut the citron into thin slices.

  2. Boil the slices in water with a small piece of alum until clear and tender.

  3. Rinse the citron in cold water.

Make the syrup and cook

  1. Make a syrup by boiling ¾ pound of sugar with a piece of ginger.

  2. Add the citron to the syrup and boil for a few minutes.

  3. Add 1 lemon for every 5 pounds of 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. Ginger + lemontop 5% of all pairs
    Smell alikestrong
    Cooked together5,154 recipes

    Shared aroma: beta-phellandrene (minty, terpene).

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

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

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

    Shared aroma: 2-nonenal (fatty, green).

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

Citron
Forms the bulk of the preserve and becomes translucent and tender as it cooks.
Sugar
Makes the syrup that sweetens the citron and helps preserve it.
Alum
Firms the citron slices so they hold their shape during boiling and syrup cooking.
Ginger
Adds a warm, spicy aroma to the syrup.
Lemon
Adds acidity that brightens the sweet syrup.

The step that matters

Boiling the slices in alum water until clear and tender. Too little boiling leaves the citron tough and opaque, while too much can break down its structure. Alum helps the slices firm up, so the cook should watch for clarity and tenderness rather than a fixed time.

Swap the lemon

How well each one fits the dish's main ingredients (sugar, ginger):

  1. Lemonthe original
  2. Orangefits about as well
  3. Limefits less well
  4. Vanillafits less well

Fit is the average pairing score against sugar, ginger. Candidates are from the same food group and used in at least 100 recipes.

“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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