Sea pineapple

The sea pineapple is an edible ascidian (sea squirt) consumed primarily in Korea, where it is known as meongge (멍게), and to a lesser extent in Japan, where it is known as hoya (ホヤ) or maboya (マボヤ). Sea pineapples are known for both their peculiar appearance, described by journalist Nick Tosches as "something that could exist only in a purely hallucinatory eco-system" and their peculiar taste, described as "something like iodine" and "rubber dipped in ammonia". However, aficionados claim that the taste is well suited to serving with sake. The flavor has been attributed to an unsaturated alcohol called cynthiaol, which is present in minute quantities.

Source: Wikipedia