Italy: jigsaw caprese

I have no idea what these tomatoes are called, so I shall call them Jigsaw tomatoes.  They are the prettiest things since David Beckham aged 31.  Made up to the classic Caprese salad in the colours of the Italian flag: 

• Mozzarella (ideally from buffalo milk, mozzarella travels very badly so if you are being perfectionist you could get it from the UK eg Laverstoke)
• Tomatoes (ideally ones that taste of tomato, not polystyrene, so basically eat in August)
• Basil (what intelligent thing can I write here about Basil? um, how about this)