This paleo recipe for Flourless (Grain Free) Gravy is very good . I've made it to accompany both white meat (chicken/turkey) and red (beef/lamb) with excellent results.

It's basically cauliflower cooked in broth/stock until soft, add pan drippings from the meat plus some seasonings, then purée till smooth. I like to add onion with the cauli as well for added flavour