Mix the white wine vinegar, olive oil, mustard and honey well, season with salt and pepper.
Halve or quarter the tomatoes depending on their size, quarter the nectarines and then cut into 2-3 mm wide slices. Cut or tear the mozzarella into bite-sized cubes. Wash the lettuce and spin dry well.
Mix all ingredients including the blueberries and serve with fresh baguette.
If you get buffalo mozzarella, you can of course use it, but I would add it at the end and not mix it with the rest, since buffalo mozzarella almost falls apart by itself.