Place all ingredients (except the raw spinach) into your slow cooker insert and stir well to combine.
Turn heat to low and cook for 7-8 hours or until the sweet potatoes and lentils are soft and cooked.
Once cooked, stir in the raw spinach until it is wilted.
Season with salt to taste and serve.
Please note that the nutrition data given here is a ballpark figure. Exact data is not possible.