Chondrus crispus
Irish sea moss is a red seaweed used for its gentle marine flavor and natural thickening power. In the kitchen, it is best known for setting or giving body to puddings, broths, desserts, and other soft preparations.1
The thickener is carrageenan, a family of sulfated carbohydrates rather than one uniform substance. Different carrageenan types can thicken without setting or form gels ranging from brittle to soft and resilient; potassium and calcium ions strongly influence which networks form as a hot solution cools.2 Whole Irish moss therefore behaves less predictably than a standardized commercial carrageenan blend, but its sensitivity to the surrounding liquid is part of its culinary interest.
Rinse it thoroughly and soak it if dried before simmering or blending. A little goes a long way, and its marine flavor works best when considered alongside the desired texture in dairy, fruit, broth, or dessert preparations.
Irish moss is a Maine sea vegetable and is cultured by approved land-based aquaculture facilities in the state. UMaine specifically lists it as a seaweed used in pudding.13
Footnotes
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University of Maine Cooperative Extension, “Sea Vegetables: The Science of Seaweeds,” accessed July 17, 2026. ↩ ↩2
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Owen R. Fennema, ed., Food Chemistry, 3rd ed. (Marcel Dekker, 1996), PDF p. 244. ↩
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Maine Department of Marine Resources, “Approved Sources of Stock,” accessed July 17, 2026. ↩