Mix all of the meat ingredients together really well.
Press the mixture onto a lined baking tray and score it into 8 portions before baking.
Bake at 180°C for 15 minutes, then cut along the scored lines.
Warm the flatbreads under the grill for a couple of minutes.
Fill each flatbread with the beef, tzatziki, cucumber and tomato, then serve with a simple salad if you fancy.
