DRIED SARGASSUM SEAWEEDS Sargassum muticum is an invasive brown seaweed that has recently found its way to the shores of Ireland. Some Sargassums are consumed fresh, others cooked in coconut milk or a little vinegar or lemon juice. It is smoked-dried to preserve it. Sargassum is also eaten by itself or added to fish and meat dishes. If not strong it can be added to salads after washing, or it can be cooked in water like a vegetable. If the Sargassum is strong flavored it can be boiled in two changes of water.