North America → Saint Lucia → Castries
🥤 DRINK

Sea Moss

Saint Lucia's creamy seaweed tonic: Irish moss gel blended with milk, spices, and sweet condensed milk into a thick, nourishing drink.
Saint Lucian · easy · serves 6
prep 15 min · cook 20 min
~134 cal · 5g protein · 18g carbs · 5g fat · 0g fiber · 18g sugars · 3g sat fat (estimated, per serving)
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Glass of thick creamy sea moss drink dusted with nutmeg
AI-generated illustration
Sea moss, also called Irish moss, is a popular tonic across the Eastern Caribbean, and Saint Lucia has a special claim to it: the island pioneered farming the seaweed in the 1980s when wild declined. Locally it is prized as a nourishing, strengthening drink, sold from vendors and made at home as a thick, milky punch.
Dried sea moss is soaked and boiled until it dissolves into a gel rich in natural thickeners, then blended with milk and sweetened condensed milk and flavoured with vanilla, cinnamon, and plenty of nutmeg. The finished drink is creamy and mild, somewhere near eggnog in richness, with only a faint hint of the sea.
Reputed to be full of goodness (and, folklore insists, an aphrodisiac), sea moss is as much health tonic as treat. Made with oat milk in place of the dairy it becomes a fine plant-based version.
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Make it yours

✓ Naturally vegetarian and gluten-, egg-, nut- and pork-free. No swaps needed.
Toggle a diet and the ingredients rewrite themselves with regional substitutes.
Dietary labels are a cooking guide, not allergen-safety advice. We track dairy, egg, gluten, tree nuts and peanuts (we count coconut as a tree nut, following FDA labeling), fish, and shellfish; we do not screen for sesame, soy, mustard, celery, or sulphites. If you have a food allergy, read the label on every product you use, and note that a kitchen can cross-contaminate in ways a recipe cannot control.

Ingredients

Serves 6
  • 1/2 cup dried sea moss (Irish moss)
  • 4 cups water
  • 2 cups milk
  • 1/2 cup sweetened condensed milk
  • 1 tsp vanilla extract
  • 1/2 tsp ground cinnamon
  • to taste freshly grated nutmeg

Instructions

  • 1
    Rinse the dried sea moss well, then soak it in some of the water for about fifteen minutes until it softens and swells.
    ✎ Chef’s note
    Rinsing the moss thoroughly removes the sea-salt smell; a squeeze of lime in the soaking water helps too.
  • 2
    Simmer the soaked moss in the water until it dissolves into a thick, gelatinous liquid, then let it cool slightly.
  • 3
    Blend the sea moss gel with the milk, condensed milk, vanilla, cinnamon, and nutmeg until smooth.
  • 4
    Chill well and serve cold, with extra nutmeg grated over the top.
Castries tradition.

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🌏 While it simmers, know your destination

📍
Castries. The dish is a make-do that stuck: imported European salt cod meeting the bananas that grew everywhere on the island. Bouyon is the other everyday pot, a thick soup of ground provisions and dumplings, and cocoa tea is made from local cocoa balls grated into hot water with spice.
🗺️
Saint Lucia. Bouyon is the one-pot: provisions, meaning yam, dasheen and green banana, cooked down with dumplings, beans and whatever meat there is until the broth thickens by itself. Cocoa tea is what starts the morning, cocoa grated from a stick with cinnamon and bay leaf, and it is a drink rather than a dessert.
🌍
North America. The most consequential technique on this continent is nixtamalisation, cooking maize with lime or wood ash. It loosens the skins, makes the dough that becomes tortillas and tamales, and frees up niacin the body cannot otherwise absorb, which is why maize spread around the world without the technique and took pellagra with it.
The story behind this dish is up top, worth a read while the pot works.

More from Saint Lucia

Green Fig and SaltfishSaint Lucia's national breakfast: boiled green bananas tossed with sautéed salted cod, peppers, and herbs.
Saint Lucian BouyonA one-pot soup-stew of salted pig tail, beans, ground provisions, dumplings, and greens in a coconut broth.
Saint Lucian Pumpkin RiceRice simmered with sweet pumpkin, coconut, and island herbs into a soft, golden one-pot, an everyday Lucian lunch.
Browse all Saint Lucia recipes →

Good to know

You’ll need: Blender.
Storing it: Keep chilled and covered, and enjoy within 2 to 3 days.

Make it a Saint Lucia meal

Saint Lucian Chicken CurryDinner
Coconut TurnoverDessert

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Frequently asked questions

What is Sea Moss?

Saint Lucia's creamy seaweed tonic: Irish moss gel blended with milk, spices, and sweet condensed milk into a thick, nourishing drink.

Where does Sea Moss come from?

Sea Moss is a Saint Lucian dish from Castries, Saint Lucia.

Can Sea Moss be made vegan, gluten-free, or dairy-free?

This Sea Moss recipe includes substitution suggestions for vegetarian, vegan, gluten-free, dairy-free, nut-free, egg-free, and pork-free versions. Treat the substitutions as a starting guide rather than a guarantee, and see the allergen note below.

Is Sea Moss safe for people with food allergies?

Our dietary labels and substitutions are a cooking guide, not medical or allergen-safety advice. We track dairy, egg, gluten, tree nuts and peanuts (we still count coconut as a tree nut to be cautious, although the FDA stopped listing it as one in 2025), fish, and shellfish, but we do not screen for sesame, soy, mustard, celery, or sulphites. If you have a food allergy, always read the label on every product you use, and remember a home or commercial kitchen can cross-contaminate ingredients in ways a recipe cannot control.

How long does Sea Moss take to make?

About 35 minutes total (15 minutes prep, 20 minutes cooking), serving 6.

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