Frozen porcini is a wonderful mushroom to have year round to add to risottos, pasta dishes and sauces. With a strong nutty flavour it is really versatile to cook with.
To prepare, allow your mushrooms that you are using to defrost most of the way, and then slice them up and cook them. While they are defrosting (in the fridge preferrably) there may be liquid that comes off of them, this is normal.
Cook them as you would fresh porcini....enjoy!