In a food processor or blender, place tomatoes, tomato paste, parsley, minced garlic, oregano, basil, salt, and pepper. Blend until smooth.
In a large skillet, over medium heat, saute finely chopped onion in olive oil for 2 minutes or until translucent. Add bay leaf and stir again for 20 seconds.
Add blended tomato sauce and vegetable broth to skillet. Cover and simmer for 18-20 min. Turn off stove. If adding sugar sprinkle in a little at a time.
Taste and adjust spices to your liking. Don't forget to remove bay leaf.