This Slow Cooker Sausage Lentil and Arugula Soup is easy.  BEYOND easy.  As in, if you can brown sausage and then literally toss every other ingredient in your slow cooker, you can consider dinner done.  D-O-N-E.  Sausage and lentils bespeckle a tomato soup base before being swirled together with peppery, fresh arugula.   I'm certainly glad I'm