Mama's Boys Burgers is absolutely fantastic! Their chicken souvlaki on a pita is by far the best I have ever had. I don't know what kind of tzatziki sauce they use, but it's incredible. The fries are also some of the best fries I've had at a burger place in Toronto. The prices are quite reasonable and the portion sizes are very good. Although it can sometimes take a while to get the food, I know it's well worth the wait!