Place all ingredients for marinade in the bowl of a food processor. Process until well pureed.
Place the steak in a baking dish large enough to allow it to lay flat. Spread the marinade mixture evenly over both sides of the steak. Cover dish and refrigerate for at least 2 hours or up to 8.
Grill steak until medium-rare to medium a hint of pink, about 7 to 10 minutes on each side. Remove to a cutting board and allow to rest for 5 minutes before slicing against the grain. Cut the slices down into pieces that will fit well in tortillas.
Serve on warmed tortillas with desired toppings.