Chinmi

Chinmi (珍味^?) is a Japanese term meaning literally "rare taste", but more appropriately "delicacy". They are local cuisines that have fallen out of popularity or those cuisines that are peculiar to a certain area. Many involve pickled seafood. The three best known chinmi of Japan are salt-pickled sea urchin roe (uni), salt-pickled mullet roe (karasumi) and pickled sea cucumber innards (konowata).

...
Wikipedia