What should I serve with onigiri and miso soup?

Hey everyone, I'm serving a couple of my friends lunch and am trying to decide what to give them. I've already decided on miso soup and onigiri, but don't know what else to give them. I need something simple, with lots of veggies in it, but something that's still Japanese. Any ideas? I'd prefer not to do anything with rice or noodles, because I am already serving onigiri. However, I'd be okay with a noodle dish. Help please! Thanks Kyandasu