Looking around for a recipe for carrot ginger soup reconfirmed that it is usually possible to find a version that suits your dietary preferences. First I found recipes that started with a stick of butter and finished with a cup of heavy cream. No doubt the soup would have tasted good, but I just couldn't make it that way knowing the importance of moving to more of a plant based diet.
This version, from the Whole Foods website, uses no fat at all thus the calorie count is very low per serving. It is maybe the simplest soup I have ever made and deemed tasty by four other people (I made a double batch and froze half for later use).