Lentil Soup

INGREDIENTS

• 1 medium onion, chopped
• 1 (14 1/2-ounce) can diced tomatoes
• 11 cups low-salt chicken broth
• 1 pound lentils (approximately 1 1/4 cups)
• Salt and freshly ground black pepper
• 4 to 6 fresh thyme sprigs
• 2/3 cup dried elbow pasta
• 2 tablespoons olive oil, plus extra for drizzling
• 2 carrots, peeled and chopped
• 1 cup shredded Parmesan
• 2 garlic cloves, chopped
• 2 celery stalks, chopped