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Dessert

To Preserve Citron Watermelon

A preserved citron watermelon made by boiling slices, clarifying, and sweetening with sugar syrup.

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

Ingredients

Directions

Prepare the fruit

  1. Remove the dark green skin and scrape the soft pulp from the inside of the citron watermelon.

  2. Cut the pulp into slices.

  3. Boil the slices in alum-water until clear.

  4. Transfer the slices to spring water for 2–3 hours, changing the water frequently.

Make the syrup and preserve

  1. Make a syrup with ½ pound of sugar.

  2. Boil the watermelon slices until they are transparent.

  3. After 2–3 days, remove the jelly from the syrup.

  4. Add the remaining ½ pound of sugar and boil again.

  5. Pour the syrup over the watermelon.

  6. Season with ginger to taste.

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

Citron watermelon
Forms the bulk of the preserve; its pulp turns clear and tender as it cooks.
Sugar
Sweetens the preserve and draws water out of the pulp, helping it turn glossy and keep.
Alum
Firms the pulp so the slices hold their shape during boiling.

The step that matters

Adding the sugar in two portions. Sugar draws water out of the pulp. Building the syrup gradually, with a first portion and then the rest later, lets the slices become clear without shrinking or toughening.

“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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