Double Lentil & Sweet Potato Soup (vegan, oil-free, gluten-free)

As much as I complain about not enjoying cold weather and shorter days, I must admit the food that is most often consumed during those months, i.e., soups and stews, is my most favorite!  I made this soup in the crock pot recently on a rainy Saturday.  Perfect! I really like lentils so a soup that calls for two kinds – even better!