Desert Roots is a great little place for a fast lunch. Since everything is vegan it's one of the best choices in Tempe for something healthy. Everything I have tried has been really good and satisfying. The salads and hummus are always fresh and server up deli style from the case. So it's really quick to stop in eat on the patio and head back about your day. The staff is exceptionally nice and helpful giving you suggestions of things to try and what they have for the day. It's a little hard to find at first since it's in a back nook off the street, but well worth it once you know here it is.
If you are curious about vegan food or just want something not fried for lunch this is pretty much the best place on Mill.