olive oil
1 tablespoon (heat in Dutch oven)
Italian sausage
2 lbs (if not using bulk, remove casing)
garlic clove
1 medium (pressed (the more the better))
tomato paste
1 (6 ounce) can (whisked in)
whole tomatoes
1 (28 ounce) can (pureed in blender or food processor)
tomato sauce
1 (8 ounce) can (whisked in)
whole onion
1 (left whole during cooking)
green bell pepper
1/2 (seeded but not chopped)
grated parmesan cheese
1 cup (added gradually)
sugar
1 teaspoon (stirred in)
dried oregano
1/2 teaspoon (stirred in)
dried basil
1/2 teaspoon (stirred in)
fennel seed
1/4 teaspoon (stirred in)
fresh parsley
1/2 cup (chopped and added at the end)
fresh mushrooms
4 ounces (sliced and added at the end)
salt
to taste (added at the end)
pepper
to taste (added at the end)
cooked spaghetti
as needed (for serving)
additional grated parmesan cheese
for garnish (sprinkle over served spaghetti)