Definitely a hidden gem! I've been in Toronto for a long time and have visited every Mexican restaurant I can find, oddly enough my mistake was not waiting for the food to come to me!
Gourmet Gringos prepared two fresh burritos, one beef and one vegetable. My wife thoroughly enjoyed her vegan burrito. Hanging onto this point, and anyone who's dated, married, or known a vegan will appreciate this. When I ordered, I specifically stated my wife was vegan. Not only did the guy make note of it, but actually took the time to repeatedly remind the food prep and cook that the burrito being made was for a vegan. Most kitchens simply receive that note on the order check and either catch it, or don't.
The beef was cooked perfectly. Not too dry but not so moist that it was suffering from typical faux burrito problems like the requisition of a drain prior to eating just to catch the five litres of water coming out of it (I never understood the Canadian need to drown food in water).
Having said all of this, the food was fantastic and we will definitely be ordering from them whenever I find their truck!