Preheat oven to 400 degrees F. In a medium nonstick skillet, cook ground beef, onion, and garlic until meat is browned; drain off fat. Stir in tomato sauce and rosemary. Bring to boil; reduce heat and simmer, uncovered, for 5-10 minutes.
Carefully split pita bread rounds in half horizontally; place pita halves, rough sides up, in a single layer on a large baking sheet. Bake for 3 to 4 minutes or until lightly toasted.
Top toasted pita bread with meat mixture; sprinkle with mozzarella cheese. Bake for 2 to 3 minutes more or until cheese is melted. Remove from oven. Top with spinach, tomato, feta cheese, and olives. Serve immediately.
Makes 4 servings. Each pizza has 260 calories, 10 grams fat, and 5 grams fiber.
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