Preheat broiler. Trim fat from steak. Season generously with salt and pepper. In a broiler pan, broil 3 to 4 inches from the heat until desired doneness, turning once. Allow 15 to 17 minutes for medium-rare (135°F) or 20 to 22 minutes for medium (140°F). Let the meat rest for 10 to 15 minutes before slicing. Thinly slice the meat.
For the salad:
Assemble the salad by dividing the lettuce among four dinner plates. Evenly top with, cucumber slices, red onion, tomatoes, cannellini beans, and cheese. Lay sliced meat across each salad and drizzle with Lemon Vinaigrette. Garnish with parsley.
For the vinaigrette:
In a screw top jar, combine the olive oil, dijon mustard, lemon juice and minced garlic. Cover and shake well. Season to taste with kosher salt and freshly ground black pepper (makes about 1/2 cup). Drizzle over salad.