Griddled Carne Asada Tacos

Or, the best carne asada tacos we've ever had

As far as I know there are only two kinds of ways to make carne asada. The first method is to take thinly sliced flank or skirt steak, sear it over mad charcoal fire, chop it up, and then stuff it into warm corn tortillas. It's almost always great. The second method is the kind that most taquerias use, which is to scoop some bits of raw steak, plop it on a grill, and sauté until it is cooked....