I have found a recipe which requires cooked chestnuts. I have only seen them roasted. How do you cook them prior to using them in a casserole type dish?
Split the skins and put them in a saucepan of boiling water with a pinch of salt, Boil for 20 mins. Strain them and allow to cool. then peel them and add to your recipe. Delicious!
Note of caution - under no circumstances should you go to the park and pluck them from the horse chestnut trees or conker tree....
This variety of chestnut is toxic.
The eating variety or the European Horse Chestnut is easy to tell apart from the other ones as the shell has a point. This will be the type you get in jars etc ready to eat or cook with.