Heat the Blackberry Balsamic, sugar and blackberries in a small pan over a low-medium heat for about 10 minutes and it coats the back of a spoon like syrup.
Strain the vinegar mixture into a small bowl pushing the blackberries with the spoon to retrieve as much liquid as possible.
Heat your grill to a high heat. Season the meat with salt and pepper.
When the grill is really hot, cook the steak for about 3 minutes each side, not moving it at all while it's cooking.
Take the steak from the grill and let it rest on a wooden board for 3-4 minutes.
Slice the steak with a sharp knife across the grain into thin strips.
Sprinkle the blue cheese crumbles over the steak followed by the chopped rosemary.
Finally drizzle some of the balsamic glaze over the steak.
Serve at once on the board and eat as is or add it to some warm mini tortillas.
