Storage: Store dried black trumpet 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.

Dried black mushrooms can be reconstituted in hot water and then sautéed in butter or olive oil, or cooked in soups, stews or sauces. Once sautéed until tender, they can be added hot or cold to salads, used to top steaks or served as a simple side dish.
Other flavors that pair well with black trumpets include wine (both red and white), marjoram, other mushrooms, caramelized onions, chicken stock and seafood.
How to Reconstitute Dried Mushrooms
Black Trumpet Mushroom Recipes
Dried Mushroom Recipes & Techniques