Brush steaks lightly with oil. In a small bowl, combine all seasonings. Sprinkle seasonings over steaks and press into both sides. Cover and chill for 1 hour.
Grill, covered, over medium heat or broil 4 in. from the heat for 7-8 minutes on each side or until meat reaches desired doneness (for medium-rare, a thermometer should read 145°; medium, 160°; well-done, 170°).
Let stand 5 minutes before slicing. Place on a warm serving platter; cut across the grain into thick slices. Garnish with orange slices and parsley if desired. Yield: 8 servings.