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Dessert

Vegetable Marrow Jam

A sweet preserve made from marrow, ginger, sugar, lemon, and cayenne pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Lemon and pepper match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Vegetable Marrow Jam

Ingredients

Directions

Prepare the marrow

  1. Peel the marrow, remove the seeds, and cut it into 2-inch pieces.

  2. Place the pieces in a preserving pan and cover with cold water.

Cook the marrow

  1. Add the cayenne pepper, thinly pared rind of the lemons, and the bruised ginger tied in muslin.

  2. Simmer gently for about 30 minutes or until the marrow is tender.

Make the jam

  1. Add the strained juice of the lemons and the sugar.

  2. Continue boiling until the jam sets when poured onto a plate.

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 + peppertop 3% of all pairs
    Smell alikestrong
    Cooked together27,047 recipes

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

  2. Ginger + lemontop 5% of all pairs
    Smell alikestrong
    Cooked together5,154 recipes

    Shared aroma: beta-phellandrene (minty, terpene).

  3. Ginger + peppertop 9% of all pairs
    Smell alikestrong
    Cooked together6,800 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  4. Ginger + sugartop 17% of all pairs
    Smell alikelow
    Cooked together14,054 recipes

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

  5. Sugar + lemontop 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

Marrow
Forms the bulk of the jam and softens into a tender, spoonable body as it cooks.
Sugar
Sweetens the jam and, with the fruit's pectin and acid, helps it set as it boils.
Lemons
Add acidity that balances the sweetness and supports the set, along with their pared rind.
Root ginger
Adds a warm, aromatic flavour that carries through the cooked marrow.

The step that matters

Continue boiling until the jam sets when poured onto a plate.. Sugar and acid only form a gel once the mixture reaches the right concentration by boiling. Undercooking leaves a runny jam, while overcooking can make it stiff or dull in flavour. The plate test shows whether it has reached setting point.

Swap the ginger

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

  1. Cardamomfits better
  2. Marjoramfits better
  3. Parsleyfits better
  4. Gingerthe original

Fit is the average pairing score against sugar, lemon, pepper. 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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