Dried king oyster mushrooms, also known as dried king trumpet mushrooms or dried eryngii mushrooms, are a type of mushroom that has been dehydrated to extend its shelf life and concentrate its flavor.
 
In terms of flavor, dried king oyster mushrooms have a rich, umami taste with nutty undertones. They're often used in Asian cuisine for their ability to add depth and complexity to dishes, especially in soups, stir-fries, and sauces. When rehydrated, they regain much of their original texture and flavor, making them a versatile ingredient in various culinary applications. Additionally, they're valued for their nutritional benefits, including being a good source of protein, fiber, vitamins, and minerals.