9 x half-litre jars (1 US pint)
Hull and peel the tomatoes. Quarter tomatoes. Boil 20 minutes, uncovered, in large pot, then press through sieve or food mill.
Put oil in a large frying pan. Add the onion, garlic, green pepper, and mushrooms (optional). Let cook, stirring frequently, until onion is translucent and the mushroom slices have shrunk. Add to the tomatoes.
Spaghetti Sauce. www.healthycanning.com