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Dessert

Citron Preserves

Citron preserves are made by boiling citron with sugar, water, lemon, ginger, and alum, then cooking in syrup.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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 ↓

Citron Preserves

Ingredients

Directions

Prepare the citron

  1. Remove the skin and soft white inner rind from the citron and cut it into various shapes.

  2. Weigh the citron and use 1 pound of sugar for every pound of citron.

  3. Dissolve alum in hot water until it tastes pungent to make a strong alum solution.

  4. Boil the citron in the alum water rapidly for 30 minutes.

  5. Drain the citron and soak it in clear cold water overnight.

  6. Boil the citron in fresh water until it changes color.

Make the syrup and cook

  1. Combine 1/2 pint of water, 2 pounds of sugar, a sliced lemon, and a small strip of ginger-root in another pot.

  2. Boil the syrup slowly to extract the ginger flavor.

  3. Drain the citron and cook it in the syrup until it shines, about 15 minutes.

  4. If the syrup is not thick enough, boil it down.

  5. Keep an eye on the citron while boiling the syrup down to prevent it from breaking apart.

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

Citron
Forms the bulk of the preserve and becomes translucent and firm as it cooks in syrup.
Sugar
Preserves the fruit and thickens the syrup, adding sweetness and body.
Alum
Firms the citron's tissue so it holds its shape through long boiling.
Lemon
Adds acidity that brightens the syrup and balances the sweetness.
Ginger-root
Contributes a warm, aromatic flavor to the syrup.

The step that matters

Boiling the syrup down while watching the citron. As water evaporates the sugar concentrates and the softened citron can break apart if it boils too hard or too long. Watching the pot keeps the pieces whole while the syrup thickens.

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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