Spaghetti Caruso

Ingredients

• 1 large onion, chopped
• 1 small green pepper, chopped
• 2 cloves garlic, minced
• 1/4 cup plus 2 tablespoons olive oil, divided
• 1 (28-ounce) can pear-shaped tomatoes, undrained and chopped
• 1 (15-ounce) can tomato sauce
• 1 teaspoon dried whole basil
• 1/2 teaspoon ground oregano
• 1/2 teaspoon salt
• 1/4 teaspoon pepper
• 1 pound chicken livers, quartered
• 1 (12-ounce) package thin spaghetti
• Grated Parmesan cheese (optional)