Preheat oven to 200°C/400°F.
Cut tomatoes into quarters. Remove seeds and finely chop.
Place pita pockets on a large oven tray. Spread with tomato paste or pizza sauce. Sprinkle with tomato. Crumble cheese slices over tomato.
Cook in a hot oven for about 10 minutes, or until cheese is melted. Garnish with fresh basil leaves (optional).