Preheat oven broiler. Marinate flank steak in lime juice, salt and pepper. Do this right on the paper the steak comes wrapped in for easy clean up. Place on broiler pan and cook, turning once until medium rare, about 4 to 5 minutes per side. Remove to a cutting board to rest.
Preheat oven to 475 degrees F.
Toss broccoli and cauliflower with olive salt and pepper, pour onto a cookie sheet in a single layer. Roast, turning once, until tender and cooked through, about 10 to 12 minutes.
Slice flank steak into thin strips, serve 3 to 4 ounces per person with a side of the veggies.