In small bowl, combine Szechuan peppercorns, cayenne, ginger and salt.
Brush both sides of flank steak with sesame oil. Sprinkle both sides evenly with garlic and seasoning mixture. Place steak in large self-sealing plastic bag and refrigerate 2 hours or overnight.
Prepare outdoor grill with hot coals on one side of grill, or heat one side of gas grill to hot.
Remove meat from marinade; pat dry.
Sear meat over direct heat 5 minutes on each side. Move meat to side of grill not over heat; grill, covered, 20 minutes or until meat thermometer registers 145° F for medium-rare. Let stand 10 minutes before slicing on the diagonal. Serve with Cucumber Kim Chee.
Whisk together first 6 ingredients in medium bowl, add cucumbers and green onions; stir to combine. Refrigerate, covered, at least 2 hours to allow flavors to blend.
Servings: 4