The one with Unagi

Any fans of the Friends episode The one with Unagi will remember this, Phoebe and Rachel take self-defense classes that have them bragging about how they can kick anyone's ass. Ross tells them that after years of studying karate he has learned that self-defense is useless without Unagi, a state of total awareness. Rachel and Phoebe tell him that Unagi is a sushi and that there's no such thing, with Chandler later telling him the same thing.

But what actually is Unagi?

Unagi is a Japanese word that is translated to “freshwater eel”. Unagi is a type of sushi that is made from a fresh, raw freshwater eel that is cut into thin slices and served with rice and sushi vinegar. In Japan, unagi is usually served with sushi rice, Wasabi paste, and a choice of toppings, such as pickled ginger, avocado, and pickled daikon. In other parts of the world, unagi may be served with different types of rice, such as pilaf, couscous, or quinoa. Unagi is a healthy sushi option because it is low in calories and fat. Unagi is also high in protein and omega-3 fatty acids. In addition, unagi is a good source of vitamin B12 and vitamin D.