Great selection of empanadas. I'd recommend La Champetre if you like meat, or the Spinach one if you're a vegetarian.
They also have a relatively diverse menu of Mexican fair and sandwiches. The burritos are massive and probably the best value on the menu, but the tacos are pretty good, as well.
They also have this hot sauce you have to ask for specifically. It's some kind of oil-based green salsa. They make it on site and it needs at least 3 days to blend (from what I'm told), and it's the TASTIEST HOT SAUCE I've found yet in Montreal.
Because it's made fresh, it varies in intensity, but it tends to range from very-hot to nuclear inferno. But no matter how hot the batch, you can still always taste all the different flavors in it.
If you're into hot sauces, I'd go there just to try it.