This recipe for flank steak salad is a healthy and delicious way to enjoy a steak dinner without all the calories and fat. The steak is grilled or broiled to perfection, then sliced thin and served over a bed of mixed greens, cherry tomatoes, and avocado. The salad is dressed with a simple vinaigrette made with olive oil, balsamic vinegar, and Dijon mustard. The result is a flavorful and satisfying meal that is perfect for a summer evening.