Heat olive oil in a large saucepan over medium heat. Add the onion, oregano, thyme, and garlic; cook 4 minutes, stirring frequently. Stir in tomato and next 5 ingredients (tomato through pepper). Bring to a boil. Reduce heat; simmer 15 minutes. Place half of soup in a blender or food processor; process until smooth, and pour into a bowl. Repeat procedure with the remaining soup. Serve warm or chilled. Sprinkle with fresh basil, if desired.