For this slow cooker recipe, I use green lentils, as they hold their shape over low and slow heat. Brown lentils are another good option.
You'll only need a few ingredients to make this easy recipe. Let's get started!
Add the soup ingredients, seasonings, and broth to your slow cooker, and set it to cook on high. Then, walk away.
After 4-5 hours, scoop out 4 cups of the soup and add to your food processor, then blend with olive oil.
Add the smooth puree back into the slow cooker. This makes the soup silky!
Season to taste, then stir in the spinach leaves and parsley. Cook on low just until the spinach wilts.
Stir in the red vinegar and give your lentil soup a final stir.
It’s ready to serve. Top your bowl with freshly grated parmesan, and enjoy!