Gather green beans as soon as the beans in the pods mature. Break off the ends and string the pods on a thread or lay them out in a single layer on a sheet. Put the beans in the sun for several days to dry, bringing them into the house at night and during rainy weather. Store for future use by hanging from the rafters or on the wall. When ready for use, soak the beans overnight and cook all day the next day. Salt and grease may be put in them while they are cooking, if available and desired.