Confession: I've only tried their sweet potato fries.
That being said, I am a sweet potato fry connoisseur and have tried a lot of places within the city. A lot. House on Parliament has the best ones, hands down. I usually have the intention of ordering something new every time I go, but I can't help it. I need that orange, yammy, deep fried goodness every time, and I'm too full from the generous helping to order more items off the menu. I'm sure I'll try something else eventually, but for now I'm more than satisfied.
Servers are always very friendly, and the atmosphere is nice and old-timey (kinda reminds me of "Cheers" actually). Everyone who's ever been to HOP always has something great to say about the food as well. So make sure you pay a visit, it's one of Cabbagetown's gems!