Am going to a Birthday Party this weekend, and the food is sushi and a Japanese spread.

I need something to bring. Would love ideas for vegetarian sushi (or at least sushi without raw fish.) Can I do Japanese Summer rolls, and what would they have in them? I've got some nice asparagus - any ideas for that? I was thinking about making some tiny teriyaki sliders - basically a teriyaki-flavored beef patty on small homemade rolls, but maybe a different teriyaki appetizer would work better.

Could use some ideas for traditional food, but also something unusual and unexpected.