Preheat oven to 450F.
Stretch the pizza dough, and roll it out if necessary. Cut circles (9-10cm in diameter) into the dough using a cookie cutter.
Roll out the remaining dough, and cut out more circles.
Place the circles on a parchment-lined baking sheet. Give them enough room, since they will grow when baked.
This recipe makes 3 types of mini pizzas, so spoon tomato sauce on to ⅓ of the pizzas.
Combine the water and olive oil together - this is called a salamoia. For the remaining pizzas, brush the salamoia on. This will keep them moist when baking.
Place the pizzas into the oven and bake for 8-10 minutes.
Remove from the oven, and place shredded mozzarella on the pizzas with the tomato sauce, and an additional ⅓ of thee pizzas (this will becomes the prosciutto and arugula pizzas).
Leave ⅓ of the pizzas without toppings (this will become the mortadella/burrata pizzas).
Place the pizzas back in the oven and bake for an additional 3-5 minutes, until the cheese is melted.
Place fresh basil on the margherita pizza.
Assemble the prosciutto pizzas: Place arugula on the pizza, top with small pieces of prosciutto, tomatoes, and parmigiano shavings.
Assemble the mortadella and burrata pizza: Place small pieces of mortadella on the pizza, top with dollops of burrata, and pistachio pesto. Sprinkle with chopped pistachios.
Enjoy your mini pizzettas!