Put it all in a blender.  Blend it up, scraping the sides with a spatula to get it going. Don't give up, and let the motor rest if it gets hot. It will eventually blend like a thick smoothie once it gets fine & hot. I don't have a food processor, but I hear it's much faster.

edit: Now that I have a food processor it's so easy! Just turn it on and let it go until it's your desired smoothness - I prefer a fast moving tornado (about 2 to 3 minutes). No need to pulse, no need to let it cool.