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Dessert

Watermelon Preserve

A preserve made from watermelon rind, ginger, lemon, sugar, and alum, boiled until tender.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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 ↓

Watermelon Preserve

Ingredients

Directions

Prepare the rind

  1. Pare off the green rind from the watermelon and cut it into 2-inch pieces.

  2. Weigh the rind and soak it in cold water, then skim out any debris.

  3. Add the salt and alum to the water and let it dissolve.

  4. Place the kettle on the stove to slowly bring the water to a boil, covering the rinds with a large plate.

  5. Boil the rinds until they can be easily pierced with a fork, then drain.

Make the syrup

  1. In another pot, boil the ginger in 2 to 3 pints of water until strongly flavored.

  2. In a separate pan, boil the sliced lemons in a little water until tender.

  3. Strain the ginger water and dissolve the sugar in it, adding more hot water if necessary.

  4. Add the rinds and lemon slices to the syrup and boil slowly for 30 to 45 minutes.

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. Ginger + sugartop 17% of all pairs
    Smell alikelow
    Cooked together14,054 recipes

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

  3. Lemon + sugartop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

Ginger and sugar 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

Watermelon rind
Forms the bulk of the preserve and becomes tender and translucent when simmered in syrup.
Sugar
Sweetens the preserve and, as it dissolves into the syrup, preserves the rind and gives it a glossy texture.
Alum
Firms the rind so it stays crisp rather than turning soft during cooking.
Lemons
Adds acidity and a bright citrus flavor that balances the sweetness.
Ginger root
Contributes a warm, pungent aroma and flavor to the syrup.

The step that matters

Boil the rinds until they can be easily pierced with a fork, then drain.. Rinds that are undercooked stay tough and do not absorb syrup well, while overcooking makes them mushy. Alum firms the rind, so the pierce test is the reliable check before the sugar is added.

Swap the lemon

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

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

Fit is the average pairing score against ginger, sugar. 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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