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Dessert

Preserved Watermelon

A preserved rind of watermelon made with peach leaves, baking soda, alum, sugar syrup, lemon, and ginger.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 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 ↓

Preserved Watermelon

Ingredients

Directions

Prepare the rind

  1. Cut the thick rind of the watermelon into small strips, removing all the red part and scraping the outside.

  2. Boil the rind with peach leaves and baking soda in 2 quarts of water until tender.

  3. Remove the rind.

  4. Place the rind in cold water with ½ tablespoon of dissolved alum for 1 hour.

  5. Rinse the rind in clear water.

Make the syrup and preserve

  1. Boil the rind for 15-20 minutes in a syrup made of equal parts sugar and water, adding lemon pieces.

  2. Add a little extract of ginger.

  3. Let the rind stand for 3-4 days.

  4. Pour off the syrup.

  5. Boil the syrup until rich.

  6. Cover the rinds with the hot syrup.

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. Peach + gingertop 8% of all pairs
    Smell alikemoderate
    Cooked together218 recipes

    Shared aroma: 1-octen-3-one (mushroom, metallic).

  3. Peach + lemontop 12% of all pairs
    Smell alikemoderate
    Cooked together947 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  4. Sugar + gingertop 17% of all pairs
    Smell alikelow
    Cooked together14,054 recipes

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

  5. Peach + sugartop 17% of all pairs
    Smell alikelow
    Cooked together2,308 recipes

    Shared aroma: beta-damascenone (apple, rose).

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

Watermelon rind
Forms the bulk of the preserve and absorbs the sweet syrup as it softens.
Alum
Firms the rind so it keeps its shape during long boiling and soaking.
Baking soda
Alters the rind's pH so it softens during the initial boiling.
Sugar
Makes the syrup that preserves the rind and gives it sweetness.
Lemon
Adds acidity that brightens the sweet syrup and balances its flavour.

The step that matters

Boil the syrup until rich. Sugar concentration must be high enough to preserve the rind and keep it from spoiling. Under-boiled syrup leaves the preserve watery and more prone to spoilage.

Swap the peach

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

  1. Orangefits better
  2. Limefits better
  3. Mangofits about as well
  4. Peachthe original

Fit is the average pairing score against sugar, lemon, 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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