Gyro Sandwiches

  1 1/4 lb Lean ground beef                    1 tb Garlic powder
  1 1/4 lb Lean ground lamb                  3/4 tb Ground pepper (or more)
    1/4 c  Oregano                             1 ts Thyme
  1 1/2 tb Onion powder                      3/4 ts Salt
      1 c  Plain yogurt                             Garlic powder
    1/4 c  Finely chopped cucumber                  Salt & white pepper
    1/4 c  Finely chopped onion                8 lg Pita breads; cut in half
      2 ts Olive oil                                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.