Flank steak is a great addition to any salad. Marinate the steak in a mixture of olive oil, red wine vinegar, garlic, and Dijon mustard before grilling. Slice the steak into thin strips and serve on top of a bed of mixed greens. Top with your favorite salad toppings like cherry tomatoes, cucumbers, and crumbled blue cheese. Drizzle with balsamic vinaigrette for added flavor.