In a pot heat up the oil, add the bay leaf, garlic and onion and cook slowly for 2 minutes stirring often. Add the celery and lentils and cook for 2 more minutes stirring often.
Add the rest of the ingredients (apart from the turkey), stir, cover and simmer for 30 minutes, stirring occasionally. 20 minutes into the cooking add the turkey (chopped or pureed).
Remove from the heat, discard the bay leaf and puree the soup until smooth. Serve with croutons, grated parmesan, drizzle of oil or balsamic vinegar, knob of butter - or simply on its own.
Notes
Use either white or dark turkey meat (or a bit of both).
For best results and smooth, creamy consistency you may have to puree this soup a little longer than an all-vegetable soup.