For the salad:
For the Sesame-lime vinaigrette:
Season steak with salt and pepper and sear on 5-7 minutes per side, depending on desired doneness. Let rest for 10 minutes before slicing. Meanwhile, combine salad ingredients in a bowl. Whisk together dressing and pour over salad, reserving a little to spoon over sliced steak. Add sesame steak to papaya salad and serve.