Omi Japanese Restaurant, 451 Church Street, Toronto, M4Y 2C5, 416.920.8991
I received an email from Michael who suggested Omi. He says "Not only does chef John Lee serve up some really first-rate fresh, creative sushi, but he also keeps a bottle of Tamari on hand - the only sushi bar in town that I've tried that does."
Sounds promising. I may have to check this out.