Storage: Store dried porcini mushrooms in an air-tight container or zip top bag in a cool, dry, dark cupboard.
Shelf Life: Dried mushrooms will retain their flavor for at least a year, but likely far longer.

Porcini mushrooms are rich, meaty and amazingly versatile, delicate enough to give grace to an elegant stew or sauce, and yet vigorous enough to stand up to something as flavorful as a thick grilled steak.
Though they can be reconstituted similarly to other dried mushrooms, dried porcinis are often added dried to braising liquids (they’re great in pot roast recipes!) soups, stews, and sauces before being simmered until tender. That way all of their flavor goes right into the dish.
While all leftover mushroom reconstituting liquid can be added to soups, used to cook risottos, etc, porcini soaking water is a particularly good addition to risottos (
how to make risotto).
Flavors that pair exceptionally well with porcinis include red meats, white wine, butter, parmesan cheese, garlic, tarragon, caramelized onions, pasta, lemon juice and zest, fish, rosemary, chicken, and thyme.
How to Reconstitute Dried MushroomsPorcini Mushroom RecipesDried Mushroom Recipes & Techniques