Begin with cold risotto; it’s easier to shape.
In a mixing bowl, combine risotto, Parmesan, salt, and pepper.
Take a small amount of risotto and flatten it in your hand.
Place a cube of mozzarella in the center.
Mold the risotto around the cheese, forming a ball.
Repeat until all risotto is used.
Set up a breading station with flour, beaten eggs, and breadcrumbs.
Roll each ball in flour, dip in egg, and coat with breadcrumbs.
Heat vegetable oil in a deep pan over medium heat.
Fry arancini in batches until golden brown on all sides.
Drain on paper towels and serve with marinara sauce.