Jamie Oliver's meatballs and pasta

Serves: 4-6

Ingredients:
* 4 sprigs of fresh rosemary
* 12 cream crackers
* 2 heaped tsp Dijon mustard
* 500g minced beef or pork
* 1 heaped tbsp dried oregano
* 1 large egg
* Salt and freshly ground black pepper
* Olive oil
* A bunch of fresh basil
* 1 medium onion
* 2 cloves of garlic
* ½ a fresh or dried red chilli
* 2 x 400g tins of chopped tomatoes
* 2 tbsp balsamic vinegar
* 400g dried spaghetti or penne pasta
* Cheese, for grating