We used to have spaghetti twice a week because it was one of the 5 meals I could make. Now it's when we feel like it. The sauce has ground beef, onion, carrot, celery, green pepper, mushrooms, green stuffed olives, a can of tomato sauce and a can of tomato paste. 2 cans of water for the paste and a couple of bay leaves.
Caramelize the onion. Sear the mushrooms. Brown the meat. Sweat the vegetables. Add the tomato sauce, paste and water. Simmer for an hour.
Fresh grated Italian parmesan on top, it makes a difference. Don't use domestic parmesan, you're cheating yourself if you do.