Heat olive oil in a Dutch Oven and add hamburger along with diced onion. Add ½ tsp. salt and ¼ tsp. pepper. Cook over medium high heat until meat cooked through. Strain in a sieve to remove any fat.
Meanwhile, puree tomatoes, or crush with your hands. Add tomatoes, tomato sauce, and tomato paste in a large saucepan.
Add hamburger, chopped celery, peppers, spices and remaining salt and pepper back to the Dutch Oven.
Bring to a boil, reduce heat to a simmer and partially cover with a lid. Stir occasionally and let cook on stove top for 2 hours.
If serving family style, add fresh basil, Parmesan, or grated mozzarella.
* if serving individual pasta bowls, prior to serving pre heat broiler.
To make individual pasta bowls, toss hot pasta with garlic butter. Place pasta in pasta bowl. Add thinly sliced mushrooms and top with measured amount of spaghetti sauce. Top with grated Parmesan and/or sliced Bocconcini.
Broil until golden brown. Garnish with fresh basil and serve immediately.
This sauce freezes beautifully, leftovers or if making large batches for other days. Simply defrost and warm.