Spinialo is a traditional seafood dish originating from the island of Kalymnos. The dish consists of fouskes, sea squirts that are marinated in a bottle of seawater. These primitive marine vertebrates usually attach themselves to shells and rocks, and when cut in half, fouskes reveal a soft flesh with a strong and bitter flavor and a texture that's similar to scrambled eggs.
Spinialo was originally a fishermen's dish, made in wine bottles filled with a dash of olive oil, seawater, and fouskes. The combination was typically served on barley rusks drizzled with lemon, and it was used as a dish eaten on long sponge diving trips.