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Dessert

Irish Moss Jelly

A jelly made from Irish moss boiled in water, sweetened with sugar, lemon juice, and wine.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Lemon and wine are a kitchen classic. They rank in the top 13% of all ingredient pairs, and cooks put them together in 6,157 recipes. Both carry decanal, which smells soap, orange peel. The science ↓

Irish Moss Jelly

Ingredients

Directions

Prepare the moss

  1. Soak the moss in cold water overnight, covering it with enough water.

  2. Add a small pinch of carbonate of soda to the soaking water to reduce bitterness.

  3. Remove the moss from the water and squeeze it dry.

Make the jelly

  1. Boil the moss gently in 1 quart of water for 5 hours until reduced to 1 pint.

  2. Strain the liquid.

  3. Sweeten and flavor the liquid with sugar, lemon juice, and wine.

  4. Mold the mixture when it begins to firm up.

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 + winetop 13% of all pairs
    Smell alikelow
    Cooked together6,157 recipes

    Shared aroma: decanal (soap, orange peel).

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

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

  3. Sugar + winetop 31% of all pairs
    Smell alikelow
    Cooked together9,581 recipes

    Shared aroma: beta-damascenone (apple, rose).

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

Moss
Its natural gelling compounds set the cooked liquid into a jelly as it cools.
Water
Extracts the gelling compounds from the moss during long, gentle boiling and forms the jelly's body.
Carbonate of soda
Reduces bitterness in the moss during soaking.
Sugar
Sweetens the jelly.

The step that matters

Boil the moss gently for 5 hours until reduced to 1 pint. Gentle heat extracts the gelling compounds without breaking them down. Boiling hard or stopping early can leave the liquid too weak to set, or make it cloudy and bitter.

Swap the lemon

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

  1. Vanillafits better
  2. Applefits better
  3. Grapefits better
  4. Lemonthe original

Fit is the average pairing score against sugar, wine. 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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