1. Preheat grill over high heat.  Generously salt skirt steak on both sides with Kosher salt.  Grill steak over high heat until well seared on both sides, about 3-4 minutes per side or until you reach desired doneness (personally I aim for medium-rare).  Remove to a cutting board and let rest for 5-10 minutes.  Slice steak into 3-4" portions with the grain, then slice against the grain into strips.
2. Top cooked fries with skirt steak, chimichurri, chopped scallions, and crumbled feta cheese.  Devour immediately.

for the Chimichurri

1. Combine all ingredients in a food processor and puree until combined but still a bit chunky.  Season generously with Kosher salt and freshly ground black pepper.  Allow flavors to meld for at least 15 minutes before serving.