In a slow cooker, combine all the ingredients except for the red wine vinegar and brown sugar. Stir well to combine.
Cover the slow cooker and cook on HIGH for 3-4 hours or LOW for 6-8 hours, until the lentils are tender.
Stir in the red wine vinegar and brown sugar into the cooked soup. Remove the bay leaves.
Serve the lentil soup hot and garnish with fresh parsley and shaved parmesan cheese if desired. Enjoy!
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Notes
Lentils do not need to be soaked before cooking.
You can add other vegetables such as diced potatoes or chopped spinach to the soup for additional flavor.
If you prefer a thicker soup, you can use an immersion blender to partially blend the soup before adding the red wine vinegar and brown sugar.
Leftovers can be stored in an airtight container in the refrigerator for up to 4 days. Reheat in a saucepan or microwave before serving.You can use green, brown, or red lentils in this soup.
Yes, you can substitute with chicken or beef stock if you prefer. It will add a slightly different flavor to the soup.