Boil the potatoes

• Place the potatoes in a saucepan with the water and salt.
• Cook over medium heat until the potatoes are tender and the water is mostly absorbed.

Mash and bind

• Mash the potatoes until smooth.
• Mix in the starch to form a firm, workable dough.

Fill the balls

• Flatten portions of the potato dough in your hand.
• Fill with mozzarella and prosciutto cotto, then close into balls.

Cook the balls

• Cook the balls in a pan over medium heat until golden on the outside and the cheese melts.
• Turn them during cooking for even browning.