Fry (sauté) the onion,
pepper, chili and garlic in the oil for 3 minutes
until softened but not browned.
Add the tomatoes and
the tomato puree blended with the water and the
oregano.
Bring to the boil, reduce the heat and
simmer gently for about 10 minutes until pulpy.
Add
the olives, if using, and the diced sausages and
cook for a further 2 minutes. Season to taste with
salt, if necessary, and plenty of black pepper.
Cook
the pasta in plenty of boiling, salted water
according to the packet directions. Drain and return
to the pan.
Add the sauce and toss well. Pile on to
hot plates and serve with the Parmesan cheese.