Ingredients
Method
- Add the lentils, sweet potatoes, crushed tomatoes and frozen kale to a 6-quart slow cooker.
- Pour in the vegetable broth and season with the salt and black pepper.
- Stir thoroughly so the lentils settle under the liquid instead of clinging to the sides.
- Cover and cook on low for 7 hours, until the lentils are tender and the sweet potatoes break easily against a spoon.
- Stir firmly to mash a few sweet potato cubes into the broth, then rest the soup uncovered for 10 minutes.