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Dessert

Watermelon Preserve

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

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. Remove the green rind from the watermelon and cut it into 2-inch pieces.

  2. Soak the rind in cold water, then skim out and add salt and alum.

  3. Let the mixture stand until the salt and alum dissolve.

  4. Fill a kettle with cold water. Place the kettle on the stove to slowly boil. Cover the rinds with a large plate.

  5. Boil until the rinds can be easily pierced with a fork.

  6. Drain the rinds.

Make the ginger and lemon syrup

  1. Bruise the ginger root. Tie the ginger root in a muslin bag.

  2. Boil the bagged ginger in 2–3 pints of water until strongly flavored.

  3. Boil the sliced lemons in a little water until tender.

  4. Strain the ginger water.

  5. Dissolve the sugar in the strained ginger water, adding more hot water if necessary.

Cook the preserve

  1. Add the rinds and lemon slices to the syrup.

  2. Boil slowly for 30–45 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 firm, translucent body of the preserve as it cooks in syrup.
Sugar
Sweetens the preserve and, as it thickens the syrup, helps preserve the rind.
Alum
Firms the rind so it stays crisp rather than turning soft during boiling.
Lemons
Adds acidity and brightness that balance the sweetness of the syrup.
Ginger root
Adds aromatic, spicy flavor to the syrup.

The step that matters

Boil the rinds until just pierceable. Alum firms the rind, but over-boiling softens it and breaks down its structure, while under-boiling leaves it tough. Testing with a fork keeps the texture right before the rind goes into the sugar syrup.

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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