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Dessert

Rhubarb and Prune Jam

A jam made from rhubarb, prunes, lemons, and sugar, simmered and jarred.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Rhubarb and lemon match in chemistry and in kitchens. They rank in the top 7% of all ingredient pairs, and cooks put them together in 546 recipes. Both carry acetic acid, which smells sour, vinegar. The science ↓

Rhubarb and Prune Jam

Ingredients

Directions

Prepare the fruit

  1. Wash the prunes.

  2. Soak the prunes overnight in enough cold water to cover.

  3. Wash and peel the rhubarb.

  4. Cut the rhubarb into small pieces.

  5. Cover the rhubarb with sugar.

  6. Let the rhubarb stand overnight.

Cook and jar

  1. Combine the rhubarb, prunes (with soaking water), and quartered lemons in a pot.

  2. Simmer the mixture for one hour.

  3. Remove the lemons.

  4. Fill hot, sterilized jars with the jam.

  5. Seal the jars tightly once cooled.

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. Rhubarb + lemontop 7% of all pairs
    Smell alikestrong
    Cooked together546 recipes

    Shared aroma: acetic acid (sour, vinegar).

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

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

  3. Rhubarb + sugartop 18% of all pairs
    Smell alikemoderate
    Cooked together1,852 recipes

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

Lemon and sugar 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

Rhubarb
Breaks down during simmering to give the jam its body and tart flavour.
Prunes
Add dark colour, deep sweetness and a soft, pulpy texture to the jam.
Sugar
Draws water out of the fruit and sweetens the jam while helping it set.
Lemons
Add acidity and natural pectin to balance sweetness and help the jam set.

The step that matters

Simmer the mixture for one hour. Sugar and fruit must cook long enough for the mixture to thicken and reach a set. Too short a simmer leaves a runny jam, while overcooking can darken and scorch the sugars.

Swap the rhubarb

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

  1. Cinnamonfits better
  2. Gingerfits better
  3. Marjoramfits better
  4. Rhubarbthe original

Fit is the average pairing score against lemon, 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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