I liked fat free refried beans as a puree. Thinned out with broth at first, but towards the end of the stage I had no problem eating them as is. Also, Eggface Ricotta Bake is a favorite for puree stage. That and more ideas can be found here: http://theworldaccordingtoeggface.blogspot.com/2007/08/pureed-foods.html
Good luck!