I've made a few variations, including the website Ferg mentioned. Personally, I love it. Yeah, hard as the back of God's head, but soak it in a bit of beans/soup and it's great. I put in the bottom of the bowl, ladle beans on top and get around to various camping duties.
Mmmmmmmm.....
Not too good if you try to add cinnamon or other such spices IMO.( This comes from the type of guy who figures he can improves almost everything) Yech!