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Watermelon Preserves

Preserves made from watermelon rind boiled with sugar and lemon.

From an old cookbook · modernised transcription
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Why it works: Sugar and lemon are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 53,532 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Watermelon Preserves

Ingredients

Directions

Prepare the rind

  1. Cut the watermelon in half.

  2. Remove the soft inside, leaving only the firm white rind.

  3. Cut the rind into desired shapes.

  4. Boil the rind pieces in enough water to cover them.

  5. Add fresh lemon peel for color.

  6. Place the rind in dishes to cool.

Make the syrup

  1. Combine 1 pound of sugar and 1 teacup of water in a separate pot.

  2. Bring the mixture to a boil.

  3. Add the rind to the syrup.

  4. Boil until clear.

  5. Add slices of lemon for flavor.

  6. Once the rind is transparent, remove it with a skimmer.

  7. Continue boiling the syrup until thick.

  8. Pour the syrup over the rind.

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 + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

Sugar and lemon barely smell alike, yet cooks put them together in 53,532 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
Provides the firm, mild body that holds its shape and turns translucent in the syrup.
Sugar
Sweetens the preserve and, as the syrup thickens, helps preserve and glaze the rind.
Lemon
Adds acidity and bright flavor that balances the sweetness of the syrup.

The step that matters

Boil the rind until transparent, then thicken the syrup. Boiling the rind slowly in syrup lets sugar gradually replace the water in its cells, so it becomes clear and firm. Boiling too hard or too briefly can leave it cloudy, tough, or watery, and the syrup must thicken so it coats the rind rather than thinning out.

“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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