1 Shape beef evenly into 12 patties.
2 In a small bowl, combine the feta cheese, chopped tomato, onion, olives, oil and oregano.
3 Top six of the patties with the cheese mixture and then cover with remaining patties and firmly press edges to seal. Sprinkle with salt and pepper for seasoning.
4 Grill patties, covered over medium hot heat for 6-8 minutes on each side
5 Serve each burger on a pita with lettuce, sliced tomato, cucumber and cucumber ranch dressing. Or make your own Tzatziki