Sea lettuce are leafy green seaweeds that look exactly like they sound . like lettuce. Sea lettuces grow worldwide in all types of waters and provide a bright green splash to any seafood dish. Given their thicker membrane, sea lettuces are generally blanched, baked, or dried. The flavor is clean and briny and sea lettuce can be thrown into and soups or broths for an instant splash of color, protein and nutrients. Dried, sugared, and powdered, sea lettuce are a great ocean-based alternative to matcha in drinks and smoothies