Combine juices, garlic, chile flakes, oregano , cilantro and oil in a mixing bowl. Pour over beef and marinate for 2 hours in refrigerator. Heat grill to medium and grill steak to desired temperature. Let rest and slice as thin as possible on an angle, against the grain.
In a medium bowl, combine the ingredients and blend well with fork or stick blender. Add the jalapeno last minute Cover and refrigerate for at least 1 hour before serving. To finish the sandwich use a french bread, cut the bread loaf into 6 slices, 1/2 inch thick. Spray tops and bottoms of bread with pan spray, and grill, just after meat is finished. Quickly grill the bread. Spread the dressing on the bread, top with the beef. Sprinkle the blue cheese on top, and serve.