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Preserve

To Preserve Citron

A method for preserving citrons by boiling with sugar, water, lemon, and ginger.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 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 ↓

To Preserve Citron

Ingredients

Directions

Prepare the citron

  1. Pare the citrons and cut them into 1.5‑inch thick slices, then into strips.

  2. Remove all the seeds with a small knife.

  3. Weigh the citron and use 1 pound of white sugar for each pound of citron.

Cook

  1. In a pot, combine 1 pint of water for every 10 pounds of citron and simmer for 20 minutes.

  2. Add the citron and boil for 1 hour or until tender.

  3. Before removing from heat, add 2 thinly sliced lemons (seeds removed) and 2 ounces of root ginger.

  4. Do not boil long after adding lemon and ginger.

  5. Do not stir while boiling.

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 + 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

Citrons
Form the bulk of the preserve, becoming tender and translucent as they cook in syrup.
White sugar
Sweetens the preserve and, at high concentration, helps preserve it by drawing out water.
Lemons
Add acidity and bright citrus aroma that balance the sweetness.
Root ginger
Adds warm, spicy aroma to the syrup and fruit.

The step that matters

Do not boil long after adding lemon and ginger. Prolonged boiling dulls the fresh aroma of lemon and ginger and can make the syrup taste flat or bitter, so the flavourings are added near the end of cooking.

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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