Three ways to eat.
1. Enjoy as it is without adding anything.
2. Add some of the condiments (Spring Onion, Wasabi and Nori) to your liking and enjoy.
3. Make Ochazuke (rice with soup) with the condiments and Dashi broth from the small pitcher.

I prefer the third way as the broth was savoury and everything went really.

Their Unagi has a light crisp to it but I do find other restaurants serves better Unagi (softer and meatier) for that price.