Seagrape

Its Latin name is Caulerpa lentillifera for the purists. It is one of the favored species of edible Caulerpa due to its soft and succulent texture.

Although called Sea Grapes (Umibudou) for their shape, it is a saweed variety!

Apparently they can be found in some islands an seas in South Eastern Asia and Oceania. World vegetarian and vegans, look out for them!
The whole seaweed can reach betwen 2 and 5 metres, but only the extremities including the grapes are consumed.

In Okinawa where they have been eaten eons, they are also called green caviar
Searape is usually eaten raw with vinegar, as a snack or in a salad.. You can eat them raw of course with soy sauce or rice vinegar mixed with mustard.