Strip Steak gets the Greek treatment paired with lemon, feta and mushrooms.
Combine Lemon Pepper Rub ingredients. Combine mushrooms, onion, oil and 2 teaspoons rub in medium bowl; toss. Alternately thread mushrooms and onion onto six 12-inch metal skewers. Finish with a lemon wedge.
Press remaining rub onto beef steaks. Place steaks and kabobs on grid over medium, ash-covered coals. Grill steaks, covered, 11 to 14 minutes (over medium heat on preheated gas grill, 11 to 15 minutes) for medium rare (145°F) to medium (160°F) doneness, turning occasionally. Grill kabobs 6 to 8 minutes or until mushrooms are tender, turning occasionally.
Remove vegetables from skewers; toss with cheese, if desired. Carve steaks into slices. Season beef and vegetables with salt, as desired.