This will show you the way to make your own tomato based spaghetti sauce that includes meat. You can also leave out the meat ingredients for a completely vegetarian meal.
Brown the meat of your choosing, and drain. If you want to leave the meat out, start with step two.
Mix diced tomatoes, and tomato paste in small bowl. In a skillet, sautee onion, mushroom, bell pepper, and garlic.
Add in tomato mixture, simmer over medium-high heat for 20 minutes.
Add brown sugar, simmer 15-20 minutes until heated through.
Serve over pasta topped with cheese.
The brown sugar will cut down the acidity of the tomatoes, making the taste more derisable.
Do not boil the sauce, as splatters will create messes.