The guy who turned me on to Las Asadas like 10 frickin years ago said there was a place in Elgin, by a casino, that had the name "oro" in it, that he claimed had fantastic steak - fire grilled. The place had the name "oro," not the casino. I know what you seek, I don't know any places, sorry. Just a suggestion, I know it's not much to go off of, but it's something. I'd ask the guy directly, and he would be happy to tell you, but he is no longer with us. So, it sounds like you are looking for fire grilled steak, and not just a taqueria. I get it, and I search that way as well. I have no idea in your area. I work with a feew other Asada lovers who live in Crystal Lake, Algonquin, Cary, and Lake Zurich. I'll ping the crowd. We all worked in Mt Prospect together, and we were all hooked on Las Asadas in Des Plaines. We know what you are talking about. There's a member here who drives from far away to get to Las Asadas that might help, forgot their user name. I'd imagine Elgin, and Carpentersville might be a place to concentrate. The guy who is longer with us used to say there were large hispanic populations there, and he hung out in those two towns a bunch.
Sorry - this was all over the place, just throwing some random thoughts out there for you.
We cannot be friends if you do not know the difference between Mayo and Miracle Whip.