amandalove:Juglens nigra is mainly grown for timber, but nuts are edible, most people grow the european walnut for the nuts. They are worth the effort, as a mature tree will produce quite a few kilograms of nuts. Once the fiberous skin rots off they need to be air dried for a few weeks. Then cracked ready to eat & there shouldn't be any staining if they are dried properly

amandalove: Some more info for ya.

http://www.treesforyou.org/Planting/TreeCare/Healthy/blk-nuts.htm

amandalove: I agree with what skipinnz said about drying them. My Dad would spread them on a screen for air circulation until the outer skin dried. Then they can be handled and cracked.
They really are quite good!