B.C.
Cook them and eat them.
Wash them off with a damp cloth.
Cut a small x in the outer hull (important step to allow steam to escape otherwise they might explode).
To roast them you can put them in a pan in the oven at 425 degrees for 30 min.
Then let them cool, then peel and eat them.
You can also boil them (unsalted water) for 20 min (still have to cut the x in them), then peel them when they are cool and eat them.
I've been told they are easier to peel after boiling.
You don't know till you've peeled them if a few have gone rotten or not, so if a few look off, just throw the rotten ones away.
Additional:
Sweet chestnuts are edible.
Horse chestnuts are NOT edible and are poisonous.
These are two different kinds of tree and you do NOT want to confuse the two when you are picking your own chestnuts off the ground.
The ones sold in the market are the edible kind.
http://tree-species.blogspot.com/2009/03/edible-chestnuts...