Rinse the pods in water, and clean them as best you can.
Soak the pods in water overnight. This step is optional, but it softens the pods somewhat, making them easier to manipulate.
Take each pod and cut down the length of the pod to open it, reaching the center where the seeds are.
Remove the seeds. You can either discard them or save them for crafts.
Place the clean pods on a baking sheet, and when you have finished cleaning out all of the pods, dry them on low heat for several hours in your oven. If you have a dehydrater, use that instead.
Once completely dry, grind the pods into a flour. I used my food processor first, and then got it into a finer powder with my coffee grinder.