Cave eel

Cave eels require level 38 fishing to catch as well as a cooking level of 38 to cook. When consumed, a cave eel will restore 70-110 of a player's life points. They are used in several quests that require the gathering of objects and can also be used in the Creature Creation activity to make a frogeel.

Cave eels or slimy eels are the primary ingredients in the popular Dorgeshuun dish eel sushi. The eel is presumably served raw and wrapped in swamp weed. However, you cannot make the dish yourself in RuneScape.