Caulerpa is a genus of seaweeds in the family Caulerpaceae (among the green algae). They are unusual because they consist of only one cell with many nuclei, making them among the biggest single cells in the world. A species in the Mediterranean can have a stolon more than 3 metres (9 ft) long, with up to 200 fronds.
Some species (especially Caulerpa lentillifera and Caulerpa racemosa) are eaten under the names sea grape or green caviar or umi-budo in Okinawa. They have a peppery taste. Seagrapes are eaten in Indonesian cuisine, sometimes fresh, and othertimes coated in sugar. They are raised in Cebu, for domestic consumption in the Philippines as well as export to Japan.