Lamb Gyros

1 pound lean ground lamb
2 cloves garlic
1-1/2 teaspoons dried oregano leaves, crushed
1 teaspoon onion powder
1 teaspoon salt
3/4 teaspoon pepper
1 large tomato, cut in half and then into slices
1 small onion, thinly sliced
4 whole pita pocket breads, cut in half, warmed

Prepare Cucumber Yogurt Sauce: cover and refrigerate. In a large bowl, combine lamb, garlic, dried oregano leaves, onion powder, salt and pepper; mix lightly but thoroughly. Shape into two oval 1/2-inch thick patties. Place patties on rack in broiler pan so surface of meat is 3 to 4 inches from heat. Broil 8 to 10 minutes or until no longer pink, turning once. Carve each patty into thin slices. Place equal amounts of lamb, tomato and onion in each pita half; serve with Cucumber Yogurt Sauce.