Cooking with kids: Spaghetti & meatballs with hidden veg sauce

Name: Cooking with kids: Spaghetti & meatballs with hidden veg sauce
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Cuisine: Italian
Ingredients: 300g good quality pork sausage (about 4 large or 8 chipolatas); 500g lean beef mince; 1 small onion , coarsely grated; 1 carrot , finely grated; 1 tbsp dried oregano; 50g parmesan , finely grated, plus extra to serve; 1 medium egg; 1 tbsp olive oil; 1 courgette , coarsely grated; 3 garlic cloves , finely grated; 1 tbsp tomato purée; pinch caster sugar; splash red wine vinegar; 2x tins chopped tomato; cooked spaghetti