1In large bowl, combine oregano, garlic powder, pepper, onion powder, cumin and salt.
2Add lamb; mix well. Form into 4 patties, about 3/4-inch thick.
3Grill over medium coals or broil about 5 minutes on each side or to desired degree of doneness.
4In medium bowl, combine yogurt, chopped cucumber, sliced green onion, mint and sugar.
5Split open each pita half forming a pocket. Place gyro-burger in each pocket; top with chopped spinach and yogurt mixture.