I live super close by, so Tacos El Asador is one of the restaurants that I frequently visit.
I've tried almost everything and I'm a fan of most of what's on the menu - but my absolute favourite are the crispy beef tacos. They're the best I've had in Toronto, and have become my go-to.
The tortillas are awesome and crispy, with the excellent texture necessary to complement the filling. Flavor is subtle - but it's all about the texture here. The beef is nice and thick, and super flavorful.
These tacos are simple, with very little additional garnish, but that's what I think makes them great. You can opt to add a bit: onions, jalapeño, salsa, lime, and/or cilantro, but you will not get massive helpings of guacamole or cheese. The veggies they do add provide that extra bit of crisp freshness necessary to cut through the mix.
There are a couple things I don't like that are on the menu: chicken and pupusas (which I know people love). I find the chicken dry and flaky - both of which combine to create a sub-suboptimal taco. The pupusas are just more of a taste thing - I don't generally like pupusas.