12 ounces of cooked beef, sliced 1/4-inch thick
1/2 cup of plain low-fat yogurt
1/4 cup of cucumber, finely chopped
1/4 teaspoon of dill weed
1 tablespoon of vegetable oil
2 medium onions, sliced into rings
1 teaspoon of garlic salt
1/4 teaspoon of dried oregano, crushed
4 pita pocket breads, warmed
1 small tomato, chopped