Authentic Supplì Recipe Rome, Italy

Name: Supplì
Prep time: 25 min
Cook time: 55 min
Yield: 4 servings
Cuisine: Italian
Ingredients: 400g (14 oz) rice; 70g (5 tbsp) butter; 70g (2.5 oz) grated Parmesan; 150g (5.3 oz) mozzarella cheese, diced; 300g (10.5 oz) minced beef; 500 ml (2 cups) tomato passata; 1 onion; 1 carrot; 1 celery; 250 ml (1 cup + 1 tbsp) wine; 250 ml (1 cup + 1 tbsp) broth; 4 tbsp olive oil; 4 eggs; 200g (7 oz) breadcrumbs; salt, to taste; olive oil, for frying