Pickled delicacy is a term used to describe EEL, which is a type of fish that can be found in both fresh and salt water. It is often served as a pickled delicacy, where it is cured in vinegar or brine and then served cold. Pickled EEL is popular in many cultures, including Japanese, Chinese, and European cuisines. It is known for its unique flavor and texture, and is often served with rice or noodles.