Heat oil over medium-high flame in an 8-10-quart soup pot for a minute. Add leeks, garlic, and onion. Sauté, stirring, for 4 or 5 minutes or until softening.
Add carrots, parsnips, celery, turnip, potato, parsley, bay leaf, thyme, sage, salt, pepper, and crushed red pepper. Cook, stirring, another 10-12 minutes.
Stir in white wine and cook a few more minutes until wine is absorbed.
Pour in tomatoes, broth, and water. Cover, raise heat to high, and bring to a boil.
Remove lid, add lentils. Stir well. Reduce heat to a good simmer and cook another 20-30 minutes until lentils are just done. Add additional water if soup becomes too thick as it simmers.
Taste and adjust seasonings. If you like, pureé a cup or two of the soup in a food processor or blender and return it to the pot after blending for a smoother soup. Add turkey; simmer another few minutes until hot. Taste and adjust seasonings one last time. Serve hot garnished with a splash of red wine vinegar.Storage: If you cooked your turkey Thursday, cooled and stored it within two hours, and are making the soup today (Saturday), you can store this soup tightly-covered in the fridge for another two days. It will freeze for 2-3 months. (Cooked turkey keeps for a total of four days in the refrigerator.)