1. In a medium bowl, mix together the parsley, oil, capers, vinegar, garlic, 1 teaspoon salt, and ¼ teaspoon pepper.
2. Heat grill to medium-high. Season the steaks with 2 teaspoons salt and ½ teaspoon pepper. Grill, turning once, 5 to 7 minutes per side for medium-rare. Let rest at least 5 minutes before slicing. Serve with the caper sauce.
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