Mix together all marinade/dressing ingredients until well combined and set aside 1/2 cup of dressing for later.
Add the rest of the dressing to a ziplock bag with the flank steak and let marinade 2 hours - overnight.
When steak is ready to cook, heat grill over medium-high heat. Cook for about 5 minutes each side or until internal temp reaches 140F. This will depend on thickness of steak.
Let steak rest for 10 minutes while you prepare the rest of the salad.
To a large bowl or plate, add arugula, peaches, avocado, corn, then add slices of steak, and top with goat cheese.
Drizzle remainder of dressing over salad.
Enjoy!