I have been going to Rol San for years. Open late, great tasting food, fast (and you can say that with hyperbole - FAAASSSSTTT) service. I'd say that a lot of people consider this a 'go-to', because it's incredibly busy on the weekends. But for good reason!
Food selection is huge, and I've also found the guys are willing to accommodate custom orders if you're looking for something that isn't on the menu!
Because it prides itself on fast 'in and out' service, it wouldn't be the choice for sit-down ambiance. But the food is great, and for out-of-towners I'd even say it's a part of the Toronto experience. Consider this place if you're looking for some late night eats.