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Dessert

Preserved Citron Rind

A preserved citron rind made by soaking, boiling, and syruping with sugar, lemon juice, and ginger.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Lemon and ginger 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 ↓

Preserved Citron Rind

Ingredients

Directions

Prepare the rind

  1. Peel and cut the citron rind into uniform pieces, discarding the seeds.

  2. Soak the rind in salted water for 2 hours, then drain and soak in cold fresh water for 6‑7 hours, changing the water three times.

  3. Drain the rind and boil it in 1 gallon of water with 2 teaspoons of alum until tender.

  4. Drain again and place in cold water.

Make the syrup and preserve

  1. Make a thick syrup by boiling sugar and water, then cook the rind in it for 15 minutes.

  2. Remove the rind and pack it in jars.

  3. Add lemon juice and ginger root to the syrup in the kettle to flavor it.

  4. When the syrup is very thick, fill the jars with boiling syrup and seal.

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. Lemon + gingertop 5% of all pairs
    Smell alikestrong
    Cooked together5,154 recipes

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

  2. Sugar + syruptop 6% of all pairs
    Smell alikestrong
    Cooked together5,842 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  3. Syrup + gingertop 16% of all pairs
    Smell alikelow
    Cooked together950 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

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

  5. 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 rind
Forms the firm, chewy body of the preserve.
Sugar
Sweetens the rind and, as a thick syrup, preserves it by drawing out moisture.
Alum
Helps the rind stay firm and crisp during boiling and cooking.
Coarse sea salt
Draws water out of the rind during the initial salt soak, firming its texture.
Lemon juice
Adds acidity that brightens the flavor of the sweet syrup.

The step that matters

Boiling the rind in alum water until tender. Alum is a firming agent, so the rind must be boiled only until tender, not longer, and then thoroughly rinsed. Overcooking softens the rind into mush, and under-rinsing leaves residual alum that tastes harsh.

Swap the lemon

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

  1. Vanillafits better
  2. Lemonthe original
  3. Pearfits about as well
  4. Raisinfits about as well

Fit is the average pairing score against sugar, syrup, 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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