I wouldn't try it because 1. i don't like onions and 2. related to one in a way - its highly unlikely that they will make it fresh to order. i'm also as a few other said, not sure about their rice. I actualy occasionally buy sushi at our supermarket because the guy that makes it - knows what the heck he is doesn't. he does it on premises and there are times when i can catch my fave eel avocado rolls just as hi finished slicing and packing them. I tried, just to try, sushi (also fresh, saw it made before me) at another supermarket locally and just. never again. that rice was an abomination. complete and utter abomination.
sushi rolls are actualy not hard to make. but you have to make sure the rice is done correctly and why the process of seasoning rice is simple, its. kinda time consuming to get it right. so... yeah...