1. Preheat broiler to high
2. Combine yogurt, olive oil, 1/4 t. pepper and 1/8 t. salt and set aside
3. Broil flatbread 1 minute or until toasted, turning at 30 seconds.
4. Cut cumcumber into small slices.
5. Heat skillet over medium-high heat. Add ground beef to pan, stirring to crumble. Drain after mostly browned. Add tomatoes to pan, cook 6 minutes. Stir in remaining salt and pepper.