Spaghetti with Homemade Marinara sauce

Marinara sauce is a base for almost every italian dish. I figured...why should I buy this sauce if I can make it at home and it will be better and it will contain less sodium and less preservatives?!
So, here is it...

1/2 cup diced onion
3 cloves garlic, minced
1 (28 ounce) can peeled and diced tomatoes
1/4 cup chopped red bell pepper
1 cup chopped fresh mushrooms
1 tablespoon dried oregano
2 tablespoons dried parsley
1 tablespoon dried basil leaves
1/2 cup extra virgin olive oil

In a saucepan sauté onion and garlic over medium-low heat until they start to become clear. Combine in a pot, diced tomatoes, red bell pepper, mushrooms, oregano, parsley, basil and olive oil. Bring to boil and reduce heat to medium-low. Simmer for at least 40 minutes.
You can use it with spaghetti or on pizza. You can freeze it or use right away
I made marinara with ground beef.
makes 4
1 lb ground beef
1 onion, chopped
1 clove garlic, minced
Your marinara sauce
spaghetti

Boil spaghetti...meanwhile, in a deep saucepan, sauté onion and garlic for about 5-6 minutes, add ground beef. Cook for another 10 minutes on low heat. Add marinara sauce, stir well.
That's it! Done! Serve it with your spaghetti and Parmesan cheese on top.