Garlic powder Salt & white pepper 8 lg Pita breads; cut in half Thinly sliced onion rings For patties: Preheat broiler or prepare barbeque. Combine ingredients lightly but thoroughly in large bowl. Shape into 16 thin patties and broil, turning once, until done as desired. For sauce: Combine first 4 ingredients in small bowl. Add garlic powder, salt and pepper to taste. To assemble sandwich, place 1 meat patty in each pita half and top with yogurt sauce and onion slices.