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Dessert

Irish Moss Jelly

A gelatinous dessert made from Irish moss, water, optional sherry, lemon juice, and sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Irish moss and lemon work together. They rank in the top 10% of all ingredient pairs, and cooks put them together in 61 recipes. Both carry coumarin, which smells sweet, hay. The science ↓

Irish Moss Jelly

Ingredients

Directions

Prepare the moss

  1. Wash the Irish moss thoroughly and soak it in cold water for about 12 hours.

  2. Strain the moss and place it in a saucepan with 1 pint of water.

Make the jelly

  1. Simmer gently for about 5 hours, adding more water as needed to maintain 1 pint of liquid.

  2. Strain the mixture, sweeten to taste, and add the lemon juice and sherry if using.

  3. Pour into a mold that has been rinsed with cold water.

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. Irish moss + lemontop 10% of all pairs
    Smell alikemoderate
    Cooked together61 recipes

    Shared aroma: coumarin (sweet, hay).

  2. Sherry + lemontop 17% of all pairs
    Smell alikemoderate
    Cooked together3,273 recipes

    Shared aroma: 1-octen-3-ol (mushroom, earthy).

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

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

  4. Sherry + sugartop 22% of all pairs
    Smell alikelow
    Cooked together4,141 recipes

    Shared aroma: guaiacol (smoky, sweet).

  5. Irish moss + sugartop 24% of all pairs
    Smell alikemoderate
    Cooked together107 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

Irish moss
Provides the gelling agent that thickens the liquid into a firm, wobbly jelly as it cools.
Lemon juice
Adds acidity that brightens the flavour and balances the sweetness.
Sherry
Adds aroma and a mild wine flavour to the finished jelly.

The step that matters

Simmering the moss. Irish moss must simmer gently for a long time so its natural gelling compounds dissolve fully. Boiling hard or letting the liquid reduce too far can make the jelly weak or cloudy, so water should be topped up to keep one pint of liquid.

Swap the lemon

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

  1. Vanillafits better
  2. Lemonthe original
  3. Peachfits about as well
  4. Applefits less well

Fit is the average pairing score against irish moss, sherry, 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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