In a large skillet or stockpot, brown the lean hamburger over medium-high heat.

Drain any excess grease from the browned hamburger.

Add the diced onion, diced bell pepper, and sliced and diced celery to the skillet.

Cook until the vegetables are softened, about 5-7 minutes.

Pour in the tomato sauce and canned tomatoes.

Add the Worcestershire sauce.

Stir in the minced garlic, garlic powder, sea salt, black pepper, and Italian seasoning.

Bring the sauce to a simmer.

Reduce the heat to low, cover, and simmer for a minimum of 3 hours, stirring occasionally, to allow the flavors to blend.

Approximately 45 minutes before serving, add the sliced fresh mushrooms and sliced black olives.

Continue simmering until the mushrooms are tender and the sauce has thickened slightly.

Serve hot over your favorite pasta.