In a pan, add olive oil, chopped onion and let it golden. Next, add ground beef and let it cook until the water dries.
Once the water dries, add black pepper, salt, tomato extract and mix. Add chieve and mix it again. Set aside.
In a pan, add mancioda already cooked and smashed, cornstarch, salt and with your hands, mix until it becomes a dogh. Then take it to medium heat and mix for 5 minutes. Finally, add the grated parmesan cheese and incorporate.
Take some of the dough, fill with ground beef and shape, closing very well. Repete this process until all the ingredients are over.
To bread, pass the balls in yolk and breadscrumbs. Repete this process with all of the balls.
In a frying pan with hot oil, fry the balls until it goldens.