How do you prepare and eat these?

People in my county don't eat these, because other types of green beans taste better, but they plant them to revitalize garden beds. They fix nitrogen in the soil.

Wow zuzu, are you sure?
You may be thinking of Bell Beans, which are also V. fava, and a smaller end product.
Broad Windsor is much more productive, with a larger seed than what you will find in a cover crop mix. BW is the winter/cover crop I use on my corn field with the bonus of spring produce.
Favas won't work in our summer heat, the proper time for true beans.
Your whole county, really?
I'll post some prep info as we work through them.

Maybe not my whole county, but everyone I know in the county who grows them. I really don't know which variety they are. People just refer to them as fava beans and say they don't eat them. The plants are fairly tall, 5-6 feet, and produce long pods. I don't know the size of the bean because I've never seen inside the pod. They apparently grow very easily here and are beneficial to the soil.