Grow your own mushrooms! The King Oyster (Pleurotus eryngii) The King Oyster Mushroom is the largest fruiting mushroom of the oyster mushroom family. Native to the Mediterranean, they are also cultivated extensively throughout Asia. They are dense & meaty, with savoury umami flavours, earthy undertones, and a hint of anise.. Our hardwood fruiting blocks are innoculated and allowed to partially myceliate prior to shipping. Watch as the mycelium cultivate your block, then slice open the wrap to allow the mushrooms to grow. Pick and eat as they develop. Delicious, succulent, and perfectly fresh.