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Drink

Irish Moss Lemonade

A citrus drink made by steeping Irish moss in boiling water, then mixing with lemon juice and sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 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 Lemonade

Ingredients

Directions

Prepare the moss

  1. Clean the Irish moss thoroughly.

  2. Place the moss in a kettle and pour the boiling water over it.

  3. Let it steep (do not boil) for 2 hours.

Make the lemonade

  1. Mix the lemon juice and sugar together.

  2. Strain the moss water over the lemon and sugar mixture, then cool.

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

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

  3. 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
Releases gel-forming compounds into the water, giving the lemonade a thicker, smoother body.
Lemon juice
Provides acidity and a bright, sharp flavour that balances the sugar.
Loaf sugar
Adds sweetness and balances the sourness of the lemon juice.

The step that matters

Let the moss steep without boiling. Boiling can break down the gel-forming compounds in Irish moss, weakening the body of the drink. Steeping gently in hot water draws them out while keeping them intact.

Swap the lemon

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

  1. Vanillafits better
  2. Lemonthe original
  3. Peachfits less well
  4. Raisinfits less well

Fit is the average pairing score against irish moss, 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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