The mushroom... without the water!
A real concentrate of flavor! Shiitake is very often used in its dried form in Asian cuisine.
Instructions
You can easily rehydrate it by soaking it for a few hours in water and then browning it in the pan with a little fat as you wish. The definite advantage is that it can be kept for 2 years. If you are not in a hurry, prefer the dried one. Packs of 400g for sale online.