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Dessert

Watermelon Preserves

Preserved watermelon rind flavored with ginger, lemon, and sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 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 Preserves

Ingredients

Directions

Prepare the rinds

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

  2. Weigh the rinds and soak them in cold water, then skim out any debris.

  3. Add ½ teaspoon of coarse sea salt and ½ teaspoon of pulverized alum to the rinds and let them sit until dissolved.

  4. Fill a kettle with cold water and bring it to a boil, covering with a large plate to keep the rinds submerged.

  5. Boil the rinds until soft, then drain.

Flavor the syrup

  1. Bruise and tie up the ginger root, then boil it in 2-3 pints of water until strongly flavored.

  2. Boil the sliced lemons in water until tender.

  3. Make a syrup using the sugar and the water from boiling the ginger and lemons.

Cook the preserves

  1. Add the rinds and sliced lemons to the syrup and boil slowly for 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, chewy body of the preserves once cooked and sweetened.
Sugar
Sweetens the syrup and helps preserve the rinds and give them a glossy texture.
Lemons
Add acidity that brightens the sweet syrup and balances its flavor.
Ginger root
Adds a warm, sharp aroma that flavors the syrup.
Alum
Firms the rind tissue so it stays crisp rather than turning mushy during cooking.

The step that matters

Boil the rinds until soft, then drain. Rinds must be cooked fully tender before they go into the syrup, since sugar hardens and toughens the tissue and softening later is difficult. Keeping them submerged under the plate ensures even cooking.

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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