Heat a large deep frying pan over high heat. Add the oil, onion and garlic and cook for 1 minute or until the onion is soft. Add the mince and cook for 5 minutes, breaking up any lumps with a wooden spoon. Add the tomato paste and cook, stirring to combine. Add the tomatoes, stock, bay leaf, salt and pepper and stir to combine. Bring to the boil, reduce the heat to low and simmer for 1 hour or until thickened.
Place the pasta in a saucepan of salted boiling water and cook for 10-12 minutes or until al dente. Drain and keep warm. Divide between bowls and top with the Bolognese, parsley and parmesan. Serves 4.