First, take a pan. Cook the sausage in olive oil in the pan until they are cooked. Keep them aside.
Now, in olive oil, add onion, carrots, and celery, and saute them until softened.
Then add garlic until fragrant.
Mix tomatoes, lentils, herbs, bay leaves, and broth.
Add sausage and bring to a boil. Add salt and pepper.
Cover up with a lid and cook in low to medium heat for 45-60 minutes until the lentils are tender.
Serve hot with grated parmesan and parsley.