To a bowl add the risotto, eggs and ½ cup (82 grams) breadcrumbs. Mix well. Add the remaining cup of breadcrumbs to a small bowl with the salt and mix well.
Scoop out 2 tablespoons of the rice and place in the palm of your hand to form a ball. Use your finger to push a hole to the center. Insert a square of mozzarella, cover and reform the ball around the cheese.
Roll each ball in the breadcrumbs to coat well. Repeat until all the balls are made. Add the vegetable oil to a large saucepan and heat to 350°F/180°C. The oil is ready when you add a little of the breadcrumbs and they sizzle.
Use a slotted spoon to carefully lower the balls into the oil, don’t overcrowd the pan. Fry for 3-5 minutes, until golden brown. Remove and drain on a paper towel. Repeat with all of the rice balls. Remove and drain on a towel or cooling rack. Serve warm.