Season the steak with 1/2 teaspoon salt and 1/2 teaspoon pepper. Grill to the desired doneness, 4 to 5 minutes per side for medium-rare. Transfer to a cutting board and let rest 5 minutes before slicing.
Meanwhile, brush both sides of the eggplant and peppers with 3 tablespoons of the oil. Season with 1/2 teaspoon salt and 1/4 teaspoon pepper. Grill until tender, 4 to 5 minutes per side.
In a small bowl, combine the remaining oil, vinegar, garlic, and parsley. Divide the steak and vegetables among individual plates. Spoon the sauce over the vegetables or serve on the side.
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