Mozzarella Meatballs

Ingredients

• 1 carrot, peeled and roughly chopped
• 1/2 zucchini, roughly chopped
• 1/2 onion, roughly chopped
• 2 cloves garlic, roughly chopped
• 1 1/2 tablespoons olive oil
• 1 x 700ml bottle tomato passata* or crushed tomatoes
• 1/2 cup beef stock or water
• 500g minced beef
• 1 cup fresh breadcrumbs
• 1/4 cup flat leaf parsley, chopped
• 1 egg, lightly beaten
• salt
• freshly ground black pepper
• 200g mozzarella cheese, cut into 2cm cubes
• shaved parmesan cheese, for serving