ive also added spicy sausage to this dish to add some protein to it
1.heat oil in pan and add onions and garlic
2.add oregano and mushrooms just before tomatoes to bring out that
3. put in tomatoes and the juice from the can
4.add ketchup and let thicken
5.let simmer as you add the rest of spices and wait till proper thickness add to spaghetti.